A question about scores and parts from a blind user

[Daniel Contreras]

Hello everyone,
I am attempting to finish and arrangement to a song for three brass parts. I'm 
not sure I fully grasp the understanding of the \include and its function. I 
have one file which contains all of the variables that I am using as well as 
the layout of the score. What I am trying to do, is used that file to create my 
parts. I have created a trumpet part file, and when I compile it using the 
variable from the score file, it returns to me a 7 or 8 page long pdf. this 
doesn't seem right to me, as the score itself is only five or six pages long. 
The part for the trumpet should be in my estimation around two or three pages 
long. I have compressed the multi measure rest. Can anyone tell me why my 
compilation is so large? Is it including the entire score all over again? 
Thanks for any help. Sorry I was unable to provide a tiny example, I had to 
step away from my computer a little bit LOL.

Daniel Contreras