You take the group editor tool. You select the prop. You frame it close on the front camera. You set preview to see-through wire frame. Your hit the button to create a new group. You drag over to select the element you want and use the main camera to see it is all selected but no part of the other elements are selelected, de-select as needed by dragging/clicking with Ctrl-key down. You can assign a material at this point. Hit the make prop button. Then you hit make new group and repeat. The texture UVs may have to be redone with UVmapper Classic. Hope this wasn't nonsense.