Moving a voice

I've got a choral score with 2 voices on each staff. What I'd like to do is to move the 2nd voice on each staff to it's own staff. I can find how to do the opposite in the hand book, but not how to do this. I'd rather not have to go through each voice and re-enter the 2nd part note by note and then delete it from the staff with the 1st part.