Hiding or delaying new staffs

[Steve Downes]

I have a situation I feel there should be an answer to but cannot find it. I 
write arrangements which start with, say, 8 bars intro during which , again 
say, up to 4 front line instruments are doing nothing. I either want to 
suppress their staffs during the intro or not create them till the end of the 
intro. I can suppress the staff itself but not the clef, time sig & key sig.    
 

Steve