PBM means "partial body morph" Essentially it is a dial that is controlled by another dial. For example on the thigh there might be a dial called "pbm_thigh-wide". It could be controlled by a dial on the hip called "thigh-wide", along with other "thigh-wide" PBM versions on the other thigh, buttocks, abodomen, shins etc. The reason to hide these PBM dials is you are only supposed to turn the control dial itself, wherever it is located. Hope this is clear enough B) Mark