Mike, the "pbm" prefix means: "This is either a Partial Body Morph or a Full Body Morph. Do not control me from this dial. I am one of a group and if you you not set us as a group it will produce distortions." Dials for all the the FBM and PBM are in BODY. The one that are also PBM will have a control dial on a central body group. For the breast morphs, the dial on chest will control the chest and both collars. The dial for elbow fix is on each shin, since this is where the joint dial that you will need the fix for is located. All the others will follow a similar individual pattern.