Converting WIndows 10 LTSC USB into HVM

Hi Folks - I am hoping someone can point me to the correct workflow.

I have a Windows 10 LTSC USB drive that automatically installs an activated version of Windows 10 LTSC.

I attempted to covert the USB to an ISO image and use that to create an HVM. It errors saying that the ISO is not bootable.

Is there a method to create an HVM directly from the USB? If so, any guidance?

Cheers.

And here we probably are missing crucial info…