I want to clear all solo parts. There is no track named silence. I don't understand your reply.
The track name shows the first instrument in the medley, it isn't by any means always "Silence".
I guess the medley (probably) is on the soloists track, but you can check by soloing the tracks to identify it.
Then you can click the track in the mixer and select no RealTrack, or no midi instrument and/or track actions->erase to remove whichever parts are appropriate.
I hope all that makes sense when you get there as I don't have BiaB in front of me and that's by memory.