Hi, Jack.. I haven't spent too much time on this yet but if you go to the track stack that holds the specific Drum Machine set..you are able to drop down and see the ' parent' Ultrabeat on a subtrack.
The rest is the same as with importing sounds and samples and the kits all appear in the extended list that you can review as usual.Just as when you choose samples from before.
I love these pre-prepared sets as you can go ahead and change things then save as your own custom track stack. Ultrabeat deserves this kind of stage and I hope it gets the cosmetic lift too so it can be brought further to the fore.