I started doing a test dungeon where I just did another floor for each test I had in mind, but some of them grew to be pretty large and awesome in the terms of classic Grimrock game play feeling,
so I was thinking to add them in my another non-test dungeon which already has a few ~complete floors.
Now, I will re-create everything I've done from scratch if I have to, but it would help greatly if there is a way to export and import single floor into dungeon.
At least copying the assets to another project works