Quote - When I go to export the object in Wings3d as an OBJ file it just goes straight to the file save location. It doesn't prompt me for anything else. :(

On the right next to "export" you can see square. Click it and you have acess to properties.

Quote - Thank you Adom!! I just tried your method and it seems to be working!!  :)

Basically I load the prop into Poser and save as an OBJ from Poser, then load the morph target into Poser and save it as an OBJ, then reload both items.

I usually use wings for morph target.
First I save obj in Poser. Later I open saved obj in wings and create morph.
YOU CAN CHANGE ONLY VERTS POSITION. YOU CANNOT DELETE OR ADD ANY VERTEX. CONNECTING EDGE = ADD VERTEX - DO NOT DO IT.
If you deleted any vertex and later created it in the same position it means you must start again.
Export as an "morph.obj". Load to Poser from menu "load morph target".

I think in this case - helm and strap - you should use magnet. It is easier. First you must select strap as a group in "group window". Later add magnet, select mag zone and in properties you can see "groups". There you can choose what part of helmet will be changed by magnet.