My problem is that when my splits save, I make a copy. Then I edit that copy to set up for another speedrun category. But the new category just overrides the original even when I made the copy.
you dont have to make a copy. if you want to make a new set of splits then edit the ones you currently have (or start from 0 by hitting "close splits") and after your splits are done hit "save splits as" and make sure the name isnt the same as some other split file