[samibe]

My guess is that it will be something that gets implemented as part of the song versioning.
In the meantime, duplicate the songs, change the page ranges to just your part, and rename them to indicate that they are just your part. (It might be a good idea to adjust the page ranges of the original songs to exclude your part, too.)
You can then add your part to the albums (along side the original song) and be able to see all parts under the album. You can add your isolated parts to setlists and paging through the setlist will only show you your parts of the songs.