I was referring to the below post by GeoffersonBill that I've copied and pasted below. In point 3. he says that "the target area is unveiled". It's not and yes, the other library is definitely showing up and we have only the one apple ID that we use on our 2 iMacs, 2 Macbook Pros, 1 Macbook air, 4 iPads, and various iPods and iPhones we use as a family, we've only ever set the 1 Apple ID up.: As many others mentioned above as happened to them, I may view both computer I'm sitting at and remote computers however I can't drag a song from my remote computer to computer I'm sitting at. It's like I can only have one open at a time.
This is what GeoffersonBill commented as a work around but it's not working for me.
"Ok, so this really helped me Nimrod. I must therefore ping back to tell you I have found a way to drag a playlist and it copy the songs. I have also included a checklist so people get this working. I am using Yosemite with iTunes 12.2.16 - copying/importing does work.
1) Log into iTunes on both machines using the same Apple ID. It must be the same one on both machines.
2) At least one of the machines is probably used with a different Apple ID than the one going to be used for sharing. Check the account listed under File > Home Sharing. Even after signing into iTunes with a different ID, the Home Sharing ID fails to change. Ensure on both computers that you turn off Home Sharing using this menu option if it doesn't show the Apple ID you are logged into iTunes with.
3) At this point you will be able to import files though the process is not exactly intuitive. Select the remote iTunes library source, and then select the songs/albums you want from any view and drag them to the left. Keep an eye on the left hand side of the iTunes application as you do so and you will notice that a target area is unveiled and the different iTunes media types (Music, Music Videos, Movies ... Tones etc) are all highlighted round with a single box. It is not possible to specify where the items end up, but for music/albums that doesn't matter - I haven't tried the other media types. Once your selection is dropped into that target area the copying will start, denoted by the status text at the top centre of the iTunes application window.
4) Now to copy a playlist, it's just one extra step. In the destination iTunes library, I repeat the destination iTunes library, create a new Playlist. Now select the playlist you want to copy. When you drag the playlist, the icon you are dragging will display the number of tracks in the playlist. You will also note, that the target appears again, this time the playlist you created in your local library is listed (on mine it was below the isolated item Purchased). Keep dragging the icon over the playlist and a target zone will be displayed highlighting only the playlist you are hovering over. Drop the icon there and once again the import will start. Once complete, you will have a playlist on in local iTunes library containing the tracks from the source playlist - but the kicker is you didn't have to copy individual files over.
I hope that makes sense and that this blow-by-blow guide helps someone else out there.
Cheers!
Geofferson Billy Bob the Third"