Took me a while to find these threads (Rendo is not the only forum that can bork all the saved thread links and bust the search engine so all the great stuff we've posted can be lost forever. RDNA has done a credible job of losing stuff.) All of these threads are related to blending two or more different "materials" in the same "shader".

Dual Materials with Stencils

Dual Materials with Stencils a step further

Multi masking

OK I'm an idiot. How do you invert a texture in Poser?

Mask a Displacement Map

Need shader help again ;)

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)