constructing a jazz piece

[Stan Mulder]

In constructing a small combo piece, I'm not sure how to modularize individual
parts. 

For example, notes are specific to a certain instrument whereas a segno
or coda is common to all parts. 

I'm confused as to where these things get inserted.

For example, Do I put the coda symbol in each of the trumpet, trombone and
clarinet parts or do I do keep each individual part as simple as possible and
add the coda instructions at a higher level?  

And then when each individual part is printed out the codas and segnos are all
there. I hope that makes sense.

Is there an example somewhere? I'm using "jazz-combo.ly" as a basis for my 
piece.