If I load the default V4 OBJ (blMilWom_v4b.obj file from Runtime > Geometries > DAZPeople) into Modo, and then click the abdomen, ALL of the body parts corresponding to the skin are selected. This is a unified mesh (see top in screen shot). 

On the other hand, if I export V4 from Poser with all options unchecked, and load that into Modo, it's split apart. On the bottom, I double-click the abdomen, and it only selects the abdomen.