How to create a macOS High Sierra VM on Sonoma running Parallels 16?

I am running macOS Sonoma on x86 hardware and Parallels 16 (I don't need Parallels often, so I don't update unless I have to). I have a Flash USB disk with a bootable macOS High Sierra (confirmed: I can boot from it on a Mac mini 2010). I would like to create a VM from this to run under Parallels. But Parallels fails to create the VM. It starts the process, says it will need 9GB, I give it 4GB RAM, I see a black screen with the white Apple logo:
then at some point it fails and I see:

No more info.

How can I create a running macOS High Sierra VM?

 

Anyone?

 

I've comes as far as finding a CDN download link that has gotten me a 8GB InstallMacOSX.dmg straight from Apple (so safe): http://updates-http.cdn-apple.com/2...cf50-4516-9011-228c78eda3d2/InstallMacOSX.dmg

Now, on Sonoma, this pkg cannot be installed. So, how do I go from there to creating an ISO that Parallels can work with?

 

Ugh. That is El Capitan. Forget about it.