Oh I didn't even know you could do the "Exclude from Project"

That's great to know, because I was wanting to somehow add in about 4 - 5 different "Main" (basically copy all of my files from previous projects, and house into a "Master" project, and still have the current project I am running compile with no errors) but I knew that would throw some big issues, with the Exclude from Project I may still be able to dot hat.