Use selected playlists. Only connect one device at a time. Each device will remember the playlists it syncs with.
The checkboxes are best suited for marking tracks that you are unlikely to want to hear by chance, e.g. interview tracks at the end of albums, or holiday music out of season, but which you nevertheless wish to keep in your library.
I did that and it works........but you can only look at the music in the order they were synced whcih is usually alphabetical by song. I like to switch between Artisits and songs when serching. Playlist do not allow you to do than other than the ipad.
Sure they do.
iTunes menu View > Show browser.