Currently, in the print organizer window, you can open one .pset file at a time and you must close it to open another. Ideally, you could add a .pset to your .pset instead of individual .dgn files.

Use case: Multiple functional groups are working on their plan sheets. Each group organizes their section of sheets in a .pset with the correct settings, scale, and sheet order. One person grabs the other groups .psets and combines them into the overall plan set. This is ideal for situations where not everyone has access to everyone else's folders and individual .dgn files and to avoid one person needing to order every .dgn file for an entire plan set.