Hi, I have an extensive iTunes library that I have curated since 2003. I have used Spotify but decided to try out Apple Music. So far it's pretty good. I've done a decent job of keeping the iTunes library and Apple Music library separate. In particular, my library is the only thing I own and has added to iTunes / iTunes Match / iCloud Music Library. My playlists contain my Apple Music songs or albums that I listen to.
However, I want to download a bunch of playlists for offline listening, but I don't want the album to appear in my library. My library is just full album with bands that I like and would love to keep it separate from Apple Music individual tracks that I added to playlists.