I don't really understand how that is useful but if you need to do it manually you can just shift click all the songs and add them all to a playlist on the desktop app
You can use the Spotify Smart Playlists feature to do this. I used to do something similar before giving up. It's clunky, but it works. You basically set it to pull all new songs from the feeder playlists into the accumulation playlists, every night.
