Have to admit I've very rarely used the partial shaders and not created any either.

From what I gather you wire together a set of nodes to create a specific effect (with no other nodes on the material you're working on). When you save the FX6 file you're given the option of where those nodes will plug into on the root node when you load it. Presumably if you load that partial shader onto a material that already has something plugged into that root node the FX6 will relace it, leaving everything else intact.

Should all be in the SS documentation.

 

PoserPro2014(Sr4), Win7 x64, display units set to inches.

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