Apple macOS Sonoma is the upcoming major release of macOS, Apple's operating system for Mac computers. The successor to macOS Ventura, it was announced at Apple's Worldwide Developers Conference 2023 on June 5, 2023. 
macOS Sonoma brings a number of new features and improvements, including:

• Interactive widgets on the desktop
• New slow-motion screen savers
• A new Presenter Overlay for video calls
• Enhanced Safari with new features for privacy and security
• New Messages features, including search filters and the ability to send money
• Improved performance and battery life

macOS Sonoma is currently in beta testing and is expected to be released to the public in the fall of 2023. So the only way to download macOS Sonoma is to download the developers version until the public release. 

1st) What are the macOS systems that can be converted to iso images using this method? 
- macOS Sonoma
- macOS Ventura
- macOS Monterey    (Download).
- macOS Big Sur        (Download).
- macOS Mojave        (Download).
- macOS Catalina      (Download).
- macOS High Sierra (Download).

In this tutorial I will describe how to create macOS Sonoma iso image to be used for virtual installers using the built-in terminal App commands.

2nd) How to download macOS Sonoma installer ?

you can use gibmacos software as described in the following video: - 

​3rd) How to convert the downloaded macOS Sonoma installer into iso?

​- The process of converting "install macOS Sonoma.app" to a bootable "install macOS Monterey.iso" which is very important as Parallel desktop app,  VirtualBox and VMWARE can run macOS installation from "iso" images only.

Carefully follow these steps: - 

1- Download macOS Sonoma using gibmacOS as described above.

​2- Run the downloaded installer "InstallAssistant.pkg" and follow the steps till you get the installer into applications folder called "Install macOS Sonoma beta.app"

​3- Copy the file called "Install macOS Sonoma beta.app" installer from the applications folder into your desktop.
Note: you have to ensure that you have enough disk space for running the full process.

4- Open terminal. using spotlight search type "terminal" and press enter. then start typing the following terminal commands:

5- Command 1: create a dmg container on the desktop of a size (15 BG) named "Sonoma.dmg": -
hdiutil create -o ~/Desktop/Sonoma -size 15000m -volname Sonoma -layout SPUD -fs HFS+J

6- Command 2: mount the Sonoma.dmg container into your device: -
hdiutil attach ~/Desktop/Sonoma.dmg -noverify -mountpoint /Volumes/Sonoma

7- Command 3: Create a bootable macOS Sonoma installer into the created dmg container  (N.B. You must have "install macOS Sonoma beta.app" into your desktop as described before in step 3): - 
sudo ~/Desktop/Install\ macOS\ Sonoma\ beta.app/Contents/Resources/createinstallmedia --volume /Volumes/Sonoma --nointeraction

8- Command 4: detach the created bootable dmg container: -
hdiutil detach /Volumes/Install\ macOS\ Sonoma

9- Command 5: Convert dmg to cdr container: -
hdiutil convert ~/Desktop/Sonoma.dmg -format UDTO -o ~/Desktop/Sonoma.cdr

10- Command 6: convert cdr to the bootable iso image: - 
mv ~/Desktop/Sonoma.cdr ~/Desktop/Sonoma.iso

NOW, you have created  a bootable Sonoma.iso image that can be used with Parallel desktop app,  VirtualBox and VMWARE and other virtual machines.

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- You have to follow these steps carefully and copy the terminal commands as it is.
​- The process of converting "install macOS Monterey.app" to a bootable "install macOS Monterey.iso" which is very important as VirtualBox and VMWARE can run only run macOS installation from "iso" images only.

- What are the macOS systems that can be converted to iso images using this method : -
- the newer macOS.
- macOS Monterey    (Download).
- macOS Big Sur        (Download).
- macOS Mojave        (Download).
- macOS Catalina      (Download).
- macOS High Sierra (Download).

- Follow these steps for converting .app to .iso : -
0- you must copy the downloaded macOS.app installer into your desktop.

1- you have to ensure that you have enough disk space for running the full process.

2- Open terminal. using spotlight search type "terminal" and press enter. then start typing the following terminal commands:

3- Command 1: create a dmg container on the desktop of a size (15 BG) named "Monterey.dmg": -
hdiutil create -o ~/Desktop/Monterey -size 15000m -volname Monterey -layout SPUD -fs HFS+J

4- Command 2: mount the Monterey.dmg container into your device: -
hdiutil attach ~/Desktop/Monterey.dmg -noverify -mountpoint /Volumes/Monterey

5- Command 3: Create a bootable macOS Monterey installer into the created dmg container  (N.B. You must have install macOS Monterey.app into your desktop as described before in step 2): - 
sudo ~/Desktop/Install\ macOS\ Monterey.app/Contents/Resources/createinstallmedia --volume /Volumes/Monterey --nointeraction

6- Command 4: detach the created bootable dmg container: -
hdiutil detach /Volumes/Install\ macOS\ Monterey

7- Command 5: Convert dmg to cdr container: -
hdiutil convert ~/Desktop/Monterey.dmg -format UDTO -o ~/Desktop/Monterey.cdr

8- Command 6: convert cdr to the bootable iso image: - 
mv ~/Desktop/Monterey.cdr ~/Desktop/Monterey.iso

NOW, you have created  a bootable Monterey.iso image that can be used with VirtualBox and other virtual machines.

​- The process of converting installOS.dmg to to a bootable "macOS.iso" is very important as VirtualBox can run only run macOS installation from "iso" images only also the iso image can be used for installation of macOS on unsupported device.

 - You have to follow these steps carefully and copy the terminal commands as it is.
- I have applied the method to macOS Sierra. you can download the official new & old macOS versions from this link. 

- Follow these steps for converting .dmg to .iso : -

1- you must ensure that you have enough disk space for running the full process, at least 40 Gigabytes.
​2- download the official macOS Sierra installer using this link.
3- double click the downloaded installOS.dmg (5.01 GB) to install the file named "installOS.pkg" which will create a file named "Install macOS Sierra.app" in the applications folder in your MAC. (N.B. Keep this file as it is and never try to open, transfer or install)
4- Now, Open terminal. using spotlight search type "terminal" and press enter. then start typing the following terminal commands:

5- Command 1: create a dmg container on the desktop of a size (8 BG) named "Sierra.dmg": -
hdiutil create -o ~/Desktop/Sierra -size 8000m -volname Sierra -layout SPUD -fs HFS+J

6- Command 2: mount the created Sierra.dmg container into your device: -
hdiutil attach ~/Desktop/Sierra.dmg  -noverify -mountpoint /Volumes/Sierra
​
7- Command 3: type this command to fix any possible error : -
sudo plutil -replace CFBundleShortVersionString -string "12.6.03" /Applications/Install\ macOS\ Sierra.app/Contents/Info.plist

8- Command 4: Create a bootable macOS Sierra installer into the created dmg container (N.B. You must have the file named "Install macOS Sierra.app" into your applications folder as described before}: - 

sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Sierra --applicationpath /Applications/Install\ macOS\ Sierra.app --nointeraction

9- Command 5: detach the created bootable dmg container: -
hdiutil detach /Volumes/Install\ macOS\ Sierra

10- Command 6: Convert dmg to cdr container: -
hdiutil convert ~/Desktop/Sierra.dmg -format UDTO -o ~/Desktop/Sierra.cdr

11- Command 7: convert .cdr to the bootable .iso image: - 
mv ~/Desktop/Sierra.cdr  ~/Desktop/Sierra.iso

NOW, you have created  a bootable Sierra.iso image into your desktop that can be used with VirtualBox virtual machine.

Before starting, we can highlight several advantages of the installation of macOS on virtual machine on MAC: - 
1- Can be used for testing of any new version of macOS instead of direct installation on the main machine.
2- Can be used for installation of unsupported macOS versions as you van adjust virtual setting in the virtual machine to help the unsupported versions to work.
3- Can be used for  testing of compatibility of certain applications on multiple macOS.
4- Give you the chance to install other macOS in isolated environment. for example you may have macOS Monterey in the main machine and on the same time you can install macOS Big Sur, Mojave, Sierra, .... on the virtual machine.
5- the process is totally free as VirtualBox is a free software and macOS can be downloaded from App Store freely. 

1- Step 1: How to download VirtualBox and the suitable extensions on macOS ?
2- Step 2: How to download macOS Monterey installer on macOS ?
3- Step 3: How to install VirtualBox on macOS and fix errors ?
4- Step 4: How to convert macOS installer.app to macOS Montery installer.iso ?
5- Step 5: How to adjust the settings of VirtualBox to be suitable for macOS.
6- Step 6: How to install macOS Monterey into the prepared VirtualBox ?
7- Step 7: How to format the virtual hard drive for macOS Monterey ?

You can watch the whole process of installation of macOS Monterey on VirtualBox on MAC in this video [12 minutes]: -

- VirtualBox is a free software so the latest version can be downloaded from its official website using the following link: -
https://www.virtualbox.org/wiki/Downloads            Just select the "OS X hosts"

- You have to download "VirtualBox Extension Pack" which provide Support for USB 2.0 and USB 3.0 devices, VirtualBox RDP, disk encryption, NVMe and PXE boot for Intel cards, from the following link: -
https://download.virtualbox.org/virtualbox/6.1.34/Oracle_VM_VirtualBox_Extension_Pack-6.1.34.vbox-extpack

- The official macOS Monterey can be downloaded from:- 
a) the App Store using this link.
b) also, you can download the official new and old macOS using this link.

- The App Store method involve: -
1- open the App Store and write in the search bar: macOS Monterey.
2- the select macOS Monterey from the search result and press "get" button.
3- wait until the download completed and never press the install button.
4- Go to the "applications folder" and search of a file named "install macOS Monterey.app"
5- Move the file named "install macOS Monterey.app" to the desktop.

1- Open the DMG installer and double click "VirtualBox.pkg".
2- Accept all the messages and follow the steps until you get a message of successful installation.
3- You may face a problem that prevent from running macOS virtual machine. The problem reports a message "Kernel driver not installed (rc=-1908)". this problem can be fixed following the steps described in this video.

- You have to follow these steps carefully and copy the terminal commands as it is.
​- The process of converting "install macOS Monterey.app" to a bootable "install macOS Monterey.iso" is very important as VirtualBox can run only run macOS installation from "iso" images only.

- Follow these steps for converting .app to .iso : -
1- you must ensure that you have enough disk space for running the full process of installing macOS Monterey on virtualBox. at least 55 Gigabytes.
2- Open terminal. using spotlight search type "terminal" and press enter. then start typing the following terminal commands:
3- Command 1: create a dmg container on the desktop of a size (15 BG) named "Monterey.dmg": -
hdiutil create -o ~/Desktop/Monterey -size 15000m -volname Monterey -layout SPUD -fs HFS+J
4- Command 2: mount the Monterey.dmg container into your device: -
hdiutil attach ~/Desktop/Monterey.dmg -noverify -mountpoint /Volumes/Monterey
5- Command 3: Create a bootable macOS Monterey installer into the created dmg container  (N.B. You must have install macOS Monterey.app into your desktop as described before in step 2): - 
sudo ~/Desktop/Install\ macOS\ Monterey.app/Contents/Resources/createinstallmedia --volume /Volumes/Monterey --nointeraction
6- Command 4: detach the created bootable dmg container: -
hdiutil detach /Volumes/Install\ macOS\ Monterey
7- Command 5: Convert dmg to cdr container: -
hdiutil convert ~/Desktop/Monterey.dmg -format UDTO -o ~/Desktop/Monterey.cdr
8- Command 6: convert cdr to the bootable iso image: - 
mv ~/Desktop/Monterey.cdr ~/Desktop/Monterey.iso

NOW, you have created  a bootable Monterey.iso image that can be used with VirtualBox virtual machines as shown in the following picture (1): - 

1- Open VirtualBox, in the main interface press new, then name the virtual machine macOS Monterey. select its version properties as "macOS 10.13 High Sierra" - Picture (2).
​2- Adjust the memory size to be around 5000 MB. - Picture (3).
3- Select the hard drive file type to be "VHD (Virtual hard Disk)" and adjust its size to be at least 35 MB. Then press create. - Picture (4).
4- Now you have created the virtual machine but it needs further adjustments. press settings and navigate to the "system" icon. then under processor tab, adjust the number of processors to be 2. - Picture (5).
​5- Under the "Display" icon, adjust the memory size to be 128 MB. - Picture (6).
​6- Under the "Storage" icon, select "Monterey.iso" to be mounted as the optical drive. - Picture (7).
7- Now the virtual machine is ready for the installation of macOS Monterey and the picture shows the whole settings. - Picture (8).

1- just open the prepared macOS Monterey virtual machine that was prepared from the last step and press "start"
2- select your suitable language and you will be taken to the recovery mode screen.

3- Open "Disk Utility" and format the virtual hard drive (35 GB) to be suitable for macOS Monterey and wait for the erase process to complete.

4- Close disk utility and select "install macOS Monterey" from the main screen.
5- Proceed with the installation as shown in the video.

​macOS installer.app have to be converted to .iso image to be used in Virtual machines (such as Virtualbox, VMware, ...)

- Please watch the upper ☝︎ video carefully and follow the steps. (in case the video doesn't work, press on this link) 
- If you find the video helpful, please press the red button and subscribe to my YouTube Channel where you will find more tutorials. this will be great and push me to do the best :).

these are the terminal commands used in the upper video: -
a] hdiutil create -o ………… -size 15000m -layout SPUD -fs JHFS+
,b] hdiutil attach ………… -noverify -nobrowse -mountpoint /Volumes/installer_goes_here
c] asr restore -source ………………. -target /Volumes/installer_goes_here -noprompt -noverify -erase
d] hdiutil detach ………….
​e] hdiutil convert …….. -format UDTO -o ……..