Hey, it’s pretty easy. So, you just take the same file you’re working on and then save it as a different file.Whatever change you make to this new file will not interfere with the original, just remember which file you saved as what.
For example, say I’m working on a game that’s very long. First, I’d create part one. Once part one is finished, I’d save it as “part one”. Then, I’d save it again as “Part Two”. You would have all of the rooms you had in part one, and you can delete the ones you don’t need.
Another thing that might help you out is that if you have houses you can explore, make them open so that you don’t have to use up one of the 30 rooms.