material question

Hi all,

I have a question for all you experts in cycles, I’m modeling the Enterprise refit from ST:TMP and I’m having a problem.

I have the saucer section textured and azteced and looking really good, but I want to add some procedural cloud noise just to grunge it a bit over the entire thing, but I can’t seem to figure out how to add this to the various sections of the ship without messing up the materials and textures I created so far.

Any help will be appreciated.