Hmmm, now the system isn't seeing the Windows installer USB. Maybe I am doing something wrong. That section is a little confusing with Legacy and UEFI Windows install or bootcamp. Is bootcamp required to dual boot, or can I install Windows on a second drive without bootcamp? I used an older version of Catalina to create the USB installer as the Monterey BootCamp assistant that is referenced to create a USB< doesn't have the option to create the USB installer, and just show a partition to install it on.
Guess I have more research to do.
What I did was Monterey / OC install USB to get the OS installed
Created a custom SDDT-Plug. I used the existing USB-EC SSDT as it appears to be a generic one. I didn't copy the SSDT-AWAC as the existing one is about the same size and not sure why it isn't named -DISABLE. Everything is working.
Copied everything to the EFI on my 1TB M2.
Following the process for dual booting Windoze and it doesn't see the installer. Is there a limit to a size for a USB installer, as I am using a 256GB thumb drive for that.
I rebooted and made the M2 the primary boot device, and formatted the 512GB internal SATA SSD to XFat with GUID.
Should I use the full bootcamp installation process? I thought I just used it to make the USB to do the install.