Actually, by just reading about how that program Baggins posted works, I found a very very simple way to do what that program does without spending one dime, and I want to share it:

1: On your Poser scene, pose your actor like you want to morph it. Once done, export it to OBJ without checking the "As morph target" box. Just export it.

2: Go on 3D Studio (or any other tool) and morph your exported OBJ. Once done, save it with a new name, leaving the original OBJ unchanged.

3: Back on Poser, get an empty frame on your timeline and zero your figure there. (Zero all morphs and all body transformations.) Keyframe it. Then load the first OBJ from step 1 above as a full body morph target, then load the second (morphed) OBJ from step 2 above also as a full body morph target. Now just go on the new dials and put the second morph as 1.000, and the first morph as -1.000. BAM! Export that as a new OBJ, control+Z those 2 imported full body morphs off your scene, and reimport the new OBJ as your morph.

Easy as 1,2,3...