You can set the TC so each harmony track is saved to its own track. Dry means not using any FX while you are recording.

You will apply the TC to the whole vocal track, which will produce whole harmony tracks. Then you will import each track into RB with your song. Hi-lite the parts where you don't want harmonies and then cut them, leaving harmonies where you do want them.

Then apply the track categories FX and mix down.

Trax