I've written a choral piece that is homophonic, and so I only need to use a grand staff to notate it. The soprano and alto parts are written in the treble clef, and the tenors and basses in the bass clef. However, at the end of the piece, the texture becomes very contrapuntal, and  the voice parts are all different from each other. Writing it for just a grand staff is going to be very difficult for a singer and director to read because it's going to be very crowded, so I want to change into 4 separate staves, one for each of the 4 choir parts. How does on do that? I'm using Finale version 25 on a Windows machine.

Thanks-Paul