Boot to a virtual hard disk: Add a VHDX or VHD to the boot menu
Native Boot allows you to create a virtual hard disk (VHDX), install Windows to it, and then boot it up, either on your PC side-by-side with your existing installation, or on a new device. A native-boot VHDX can be used as the running operating system on designated hardware without any other parent operating system.
https://docs.microsoft.com/en-us/windows-hardware/manufacture/desktop/boot-to-vhd--native-boot--add-a-virtual-hard-disk-to-the-boot-menu?view=windows-11