How can a derivative track be added if the track founders are not active? This is a general question, though I do have a specific track in mind (Centaur on android).

The Pinball Arcade (TPA) has released many tracks on android since the original founders added their initial set of derivatives.

If I add a new track (easy enough to do) it won't sort in the same sub set that all the other TPA tracks are listed within.