How to setup 2nd Os installed on volume APFS
I've got Monterey installed on my (newest old)SSD MBP. I added a volume on APFS then installed Os High Sierra from a bootable flash. But then ran into trouble with the setup.
I started to set up without Apple ID and then decided to but it said I had to update ID then rejected the email (though I was sent an email that someone had logged into iCloud??) It's asking me for a folder name? is that the folder on iCloud. I haven't really used it before and have been using the same ID for 3 MBPs, I think?
So how do I set up a separate OS on the same computer?
Thanks for any help.