Either that, or use MorphManager or similar program to do it :) PoserFileEditor here in the MP will do it as well (along with LOTS of other neat things) MorphManager is free - problem is where to find it these days L (Last I think I found it at Netherworks) 

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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.