Convert Physical drive to VM

I have a Mac pro with 4 drives in it, one which is High Sierra which I need on occasion but booting into it is time-consuming and a pain. Is there a way to convert that existing drive into a Parallels one?

 

Unfortunately, there are no such options in Parallels Desktop.

 

I would try installing High Sierra into a VM and making the drive available to the VM. You can then use the Migration Wizard to import apps, data, and configuration.