P12 uses Pixar's OpenSubDiv v3. The subD level is taken from the Preview value i.e. 0 = subD off, 1 = 1 level etc. I don't think it's possible to export body parts with different subD levels, but I've never tried ;)

I should mention that higher-res morphs can fail on occasion, mainly when passing data back and forth to Zbrush to edit the same morph (something fiendish to do with tangents). I've found it very uncommon but something to be aware of.

Another option might be to use the Fitting Room to transfer a shape from one mesh to another, though I also haven't tried that (I think vilters was experimenting with it). Not sure what level of detail/performance trade-off there would be.

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