How to handle system objects?

[Carl-Henrik Buschmann]

When working with large projects (or small for that matter) like an orchestral 
piece, how do one best handle system wide objects like repeats, rehersal marks, 
tempi etc? It is tedious entering every thing in every voice, not to mention 
prone to errors.

One idea i have is to make a silent voice and embed (not sure of the 
terminology here) it into every staff, but i'm not sure if it is the best way, 
nor how to execute it. 


Hope your day is/will be brilliant!
Carl-Henrik