If a file only contains 2 variations, how do I copy the same 2 files into variations 3 and 4? Reason being, in case I dont want to create 2 more variations, I would feel better if they were filled...

easy,
go to composer, pattern copy, put the existing variation 1 and then 2 in the left hand side of the screen and set variation 3, then 4 of the same composer in the right hand side of the screen. Ok each copy.