Loading Screen System (Level Transitions w/ Progress)

I have a main level with a bunch of sublevel tutorials. I want to keep the persistent level at all times, but swap the tutorial sublevels without going back to the transition level every time, if I can’t do that I would like to set the transition level to a new one ( tried this via set Transition Level then calling transition ) for this tutorial level and then set it back at the end. How would I do this?