Vocal Pitch Bend

Was it really a pitchbend, or was it an "Auto-Tune" effect that's very popular these days? The latter you can create by setting the "adjust tuning" slider to the maximum level.

Sorry, there's not pitchbend for real tracks in GB.

Actually, there is: Put the AUPitch effect on a track (in the info pane) and create an automation for this effect (in the track header). Then you can create a pitch curve. I don't know if the result will be satisfactory.

I'm not sure I understand what you are asking. As for the interaction between the pitch correction and the AUPitch: I don't know, it might sound messy - just give it a try! And none of these effects are permanent, everything is done on-the-fly and your original recordings remain untouched.