Why can't I access the playlist button when adding songs to a playlist?

Under iOS 6, when editing a playlist (adding music to it), I had access to the playlist button in order to add all the music from one playlist to another. Under iOS 7, one can only access the song, artist, album, and composer buttons from the Edit/+ screen. So if I want to add 5 songs that I know are together on another playlist, I have to find them again in an alphabetical list? Yikes, a severe downgrade in functionality under ios7. Will this ability return or am I just missing something obvious that should let me do it?