A far better method to acomplish what you are trying is instead to make the objects a single object in your modelling program, and then assign material or surface values to the different parts you want.  When you export the object, I recomend using wavefront OBJ and also saving the material file (.MTL) with it.  When you import it into Poser, go into the material room, and you should have different materials for the areas you set up.  It is far less messy this way, and far more suitable for commercial propping.

I am not specifically familiar with C4D so I can not talk you through the steps to set up the different surfaces in that program.  There are a number of free programs, however, that will let you redefine surfaces and materials on an object.  If you need such a program, try doing a google search for Meshlab.

Hope this helps.

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