Changing stave types during score notation

I am trying to work out if it is possible to add additional parts during a score. I have written a piece of music that has 5 verses. The first is a single vocal line. The second and third verses is 4 part harmony (SATB closed score) , the fourth verse is SATB closed score but adding a solo part above, the last verse is SATB on 4 separate staves as there is lots of separate movement between parts so closed score doesn't work well. Is this possible? I don't want to run the whole thing as a 5 part piece as half of it would end up as empty bars and look really messy!