Empty staves - what to do?

Do you have an extended passage where an instrument doesn't play?  Don't delete those staves.  Hide them.

Often in chamber music, especially in wind music, the composer will give the wind instrumentalist an extended rest, and the piano score will have a long section with empty staves except for the piano part.  If you delete the empty staves to display only the piano part, then you won't be able to work in the wind instrument part without substantial reconstruction of the empty staves.

It is far easier to hide those empty staves, and almost every engraving software program has this feature.  Just hide them in the piano score, and then they will show up in the dynamic part as multiple empty measures, which you can turn into a muti-measure rest.