How to dual boot?

Yes before you ask, I’ve already looked at the post in the sidebar, but I’m hella confused.

I’ve got 2 drives. One has Windows 10, the other has Catalina on it.

How do I dualboot with these two drives? Before you tell me to Press F8 at startup or something, I can’t, OpenCore is not on the startup menu, so I have to use the USB to use it.

submitted by /u/TechnoRandomGamer
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