If you are going to work on the full figure I suggest that you work on the figure's OBJ file rather than export a copy out from Poser. Exporting will work, but working on the base OBJ file will work every time.

**If your modeler requires that the object be one unified group or if your modeler messes up the group names:-
**Open the base obj file in UVMapper and export out the UV's. Select to include groups, you can also include materials although that is not essential. If your modeler requires that the object be one unified group use UVMapper to assign everything to a single group at this time. DO NOT use the weld function! Save with a new name.

Load the object into your modeler. If you need to change scale be sure that you can rescale back again without changing the model's world location/orientation.

Create your morph.

Save the morphed OBJ file.

If you need to reinatate the grouping or group names:-
Open the morphed OBJ in UVMapper and import the previously saved UV's. This will reinstate the original grouping (and materials). Save the OBJ file.

Edit the original figure's CR2 file to point to the morphed OBJ file.

Load edited figure into Poser.

Export out each body part as required and use as morph target to the original figure.

**Why this works, (and why some other work flows don't).
**
Grouped OBJ files can have either welded or unwelded seams. Welded groups share the vertices at the seam boundary, unwelded groups duplicate the vertices at seam boundaries. Poser can work with both BUT when Poser loads a figure it effectively converts everything to an unwelded type, duplicating the vertices at the seams.

(To see a script that very effectively illustrates this go to http://www.philc.net/forum/viewtopic.php?t=3021 )

By making the morphed object into a Poser figure then exporting out each body part you ensure that Poser is always comparing apples with apples.

The Poser Tool Box has  tools that help automate this process. See "Load Morphs from OBJ"