In I tunes on PC, click on music, click on songs. On the right, click in the space at the bottom of the library. Crete Playlist (call it something like Yimbos playlist.) Then drag and drop the 20 - 30 songs you want in to it (These are not duplicated) Then , in I Tunes, edit, Preferences, Devices, tick the box that says "Prevent IPods etc from synching automatically." Save . Then attach your phone and in options to synch, "tell" it to synch only the Yimbo playlist. I have not done this bit for a few days so you'll have to fiddle to get this right.
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