Staffs problem in a choir piece

[Schweikert, Martin {POYD~Kaiseraugst}]

Hi!

I have a problem with a piece for choir and soprano solo.

- It starts with a soprano solo, 
- then follows a part for soprano, alt, tenor and bass (without the soprano 
solo),
- then follows a part for soprano solo, soprano, alt, tenor and bass.

It is no problem to arrange the voices in three staffs (1 for soprano solo, 1 
for soprano & alt, 1 for tenor & bass).

The problem is: 

- In the first part (the soprano solo) there is no need for the staffs for the 
four voices - they are quiet
- In the second part (no soprano solo) there is no need for the soprano solo 
staff - it is quiet

How can I tell Lily to suppress the staffs which are not needed?

Best Regards / Mit freundlichem Gruss
Martin Schweikert
-- 
F. Hoffmann-La Roche Ltd.   Division Pharmaceuticals
IT Service Unit Basel       DOCUMENTUM Services
Department POYD-D           Bldg. 223 / Room 311
Phone +41 61 688 3188       Fax +41 61 687 2770