In the case of applying the Pookling Twins morphs to Steph and David, it's really easy. You just load up the figure, then apply the morph and mat pose. Apparently Luke and Laura morphs are by default interchangeable with Steph Petite, V3, David. This is how Thorne explained it over at the DAZ Forums: "One good thing about all these gen3 figures is the empty community channels that DAZ built in. They all have identical names (PBMCC = Partial Body Morph Community Channel): PBMCC_01 through PBMCC_30 for David, Steph, and the Twins (V3 has 50 empty community channels and is also compatible with the Twins; M3 and the Freak are only compatible with each other). This means that any custom morph targets (such as the pookie twins) that use these channels will also readily inject into any of the figures listed above. The Pookling Twins use PBMCC_01 for the faces, 02 for the ears (all our figures use these 2 channels the same way) and channels 03 and 04 are for the other custom nose morphs. Probably more information than you really wanted to know, but that is the reason all of our custom gen3 characters will always be interchangeable with each other! "