Tbat's how I did it. I use a few Acoustic Bass and Bossa Guitar RTs. I looked through my RealTracks folder and moved the ones I did not want out. If you have a lot you want to keep, you probably need to do that a few times checking inside BIAB to see if any need to be removed or brought back to your needs. Don't forget to Rebuild the RT list after you manually move the folders. You'll see some warning messages that can be ignored.