Splitting 2 parts from a single staff

I was recently sent a PDF of a score that I want to "tinker with" to revoice some of the parts. It is a 4-part barbershop arrangement, with two parts (Tenor / Lead) on one staff, and (Baritone / Bass) on the other. The PDF translation on Muse Score came through relatively close to the PDF score, so I think I can deal with the necessary note changes to fix that.

However, is there a way to split out the two parts on a single staff into two separate staffs (without just reentering each part?)

Thanks.

Bruce Kenyon