Eddie,

In Real Band most of us simply hilight and cut out parts where we want silence.

Because RB displays each instrument in its own track, its very easy to silence one track without affecting anything else.

If you don't want to destructively remove it with a hard delete or cut, you can always go to piano roll and use a volume envelope to reduce volume where you want silence. That way if you change your mind you can change the volume and get your part back.

(Or, you can just regenerate that section if you DID delete it and you want it back..)

lotsa options.