I have Windows 10, and Mojave on two separate hard drives in my Hackintosh build currently. How do I add High Sierra on a separate Hard Drive to this build?

Hey Hackintosh'ers, I was hoping for some guidance to adding /installing a hard drive with High Sierra to my Hackintosh build. I currently have Windows 10, and Mojave on two separate hard drives in my build. Everything is running fine, but I want to add High Sierra due to Nvidia graphics support. Any advice or suggestions on how I can do this? I've read the guides on the sidebar as well as done some searching and reading on google, but I wasn't sure how to approach it since I already had a completed build with 2 operating systems on seperate hard drives.

Thank you!