What they are: the same as FBM except that they are contolled by one morph in the group - rather than a bit of script in the Body section. This is all new, but the way I think about it is like this: a breast morph that only involves the two collars and perhaps the chest, can be controlled by a morph in the central location (usually chest) and by turning this dial all are set (both breats). This is really useful for a morph like elbow fix. It involves the shoulder and forearm. The joint to bend at the elbow is a forearm channel. By having the controlling morph also a forearm morph both parts of the morph can be set as they were intended to be set from the same place as the joint channel. That is, you can do the fix while you and moving the joint. The knee fixes and both shin controlled. (DAZ saw what I did not - a way to do the squat morph. - It is not a JCM - the way Poser works now, it can not be a JCM.) The pbm designation on the morph dials is meant to inform that the morph is not supposed to be used in isolation. The Faery morphs, Narrow hip - all of the FBM morphs are supposed to be set from their central dials only. These morphs span several groups and if they are nor set all together, the seams between the groups get busted. One gets too large or too small in relation to its neighbor. DAZ is attempting an education process with this. It is evident from the large number of characters out there with busted seams, that the way to use these morphs is not widely understood. Every morph in a FBM or PBM should have identical settings.