[Zubersoft]

You can do both those things with setlists. For example, go to the Setlists tab, long press a setlist to select it, then tap "Add songs to Setlist" and select the other setlist in the list. Now all the songs will be merged into one. You could also select both setlists and then tap "Create Setlist from Songs" to create a new setlist with all songs combined. You tap a setlist to view the songs, long press a song to start selection, tap every song you want to copy, then tap the three dots at the top right and tap "Add Songs to Setlist" and then select the other setlist to add them to. 

There is one other option I haven't mentioned - if you rename a setlist so that it matches the name of an existing setlist, MobileSheetsPro will ask if you want to merge them. They will then be combined. Unfortunately, this option is missing code to copy the setlist notes into the merged setlist. So that is a bug that I will have to fix.

Mike