I have a similar question to the one above, and because everyone seems knowledgeable about sharing, I'm going to give this a shot:
I have an extensive library of shared tracks [both purchased and ripped] that are shared between two computers. I created a specific playlist for the phone [it's only 16 g]. When I go to itunes/more/shared on the iphone [6.oi] I see the shared libraries, and if I go into one, I get a store button on the upper left. However, if I click on the playlist, I will get all the track titles [even after the sharing computer's itunes is closed, but they don't play, there nothing there.
Because my whole library is way bigger than the phone, I need a way to be able to pick and choose tracks, or at least playlists from the home computer.