I'm not 100% sure my answer is relevant, because I'm not completely sure what you are asking for. In any case, if I understand what you want to do, you can add songs to your playlists easily without first listening to them. On the list of songs, where the song you want to add is, swipe your finger from left to right accross the track you wish to add. Then tap the + symbol in the center. You should then get a screen that allows you to select the playlist to add the song to.
Hope this helps!