Right. Easiest part is to assign a material to those parts of the model you want to make a mirror, and then use a P6 Mirror shader on it :o) Ajax has some great shaders here in Free Stuff with (among other things) some great looking mirrors, but it's actually just to connect a Reflection node to the mirror-parts and have a black base colour. And there's your mirror :o)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.