Delete measures of a empty staff
 

hello
My name is Franco , I am Italian , and I am a new member to the Forum, I greet all
in particular the webmaster!
I have a question :
Let me know if you can delete the empty measures of a single staff ,
for example : I create a new staff of a particular instrument, which will only play from the twentieth to the thirty-fifth measure , what I want to know you can delete the empty measures from number one to number twenty ?
and the number 36 to the end of the song ?
I think that long ago I was able to do this,
maybe now I forgot .......
And more :
you can import into Composer , sounds different from the default ones ?
For example, a drum kit , a synth sound ?
If this is possible where can I download these sounds ?
and what extension do they have?
I state , that I have only the master keyboard , which does not have any sound in them, and normally use to play VSTI .
I hope I explained myself , and you understood my bad English
Unfortunately, I do not know the language, and I'm using an electronic translator .....
Thanks in advance
Franco