Is module style sheet building possible?

I build project estimates, from one project to the next I need to build different "modules" that i have created, each compromises of its own products/labour/costs.

When all "modules" are in place for the project requirements I link the totals and calculate grand total.

Currently im copying and pasting but need a better way of doing this. The modules are sized differently and I have around 60 of which most projects require 5 - 20.

What function(s) can I look at for this?