Hi Bernard, One program that definitely works for grouping is UVmapper. It it primarily for texture mapping but does more. You select the faces off the 2D map, select "assign to group" give it a name and when finished grouping save the model. These groups will be present when you load it into Poser. It only works with OBJs, and unless you buy the Pro version (there is a free "classic" version) you are limited to working on 2D maps so a complicated model is almost as difficult as Posers way. Ill leave others to list the 3D modellers that do grouping.