Add a separate system (solo stave) on the same page?

Hey,

I'm writing a choir piece. There are four voices. Four separate staves (SATB). It all fits on the same page and i still have some space left in the bottom. There i wanted to add a small solo part for the tenor. But I dont want to add all the different staves, only one. Since I only will have notes on one of them. Or otherwise it wont fit.

Is this possible to do?

Thanks a lot
MM