How to backup PART of iTunes library...?

I record a daily radio show, and now that 2006 is ending, I want to move those files to a different iTunes library, so it is not taking up the 30+ Gb in my main library. However, the only option I see is Backup to Disc... Can anyone tell me how I would move these files to a new library?

 

Hmm...not quite.

OK, so I have a playlist of the radio shows from 2006. Some of the recordings I want to keep (let's call it "Best of"). The rest I want to dump in a second playlist to reference them later. So I have a Smart Playlist that filters out the "Best of" (which is in the Genre field). I want to physically move the remaining recordings to a separate library.

I was thinking that I could use "Export..." to export the playlist as an XML file, then import it into the new library on the separate drive. Once imported into the new library, would I then delete the files from the "master" library?