I topologicalized the model to a G2 mesh. In Blender, I deleted the broken eyeballs, separated the eyeballs from the G2 base mesh, and merged them with the new model. Finally, it was successfully imported as a deformable model, but dragging the deformer bar caused the model to explode. I know that DAZ can restore the eyeballs and other body parts to their default meshes. I'm just curious why I can't separate and merge the models.