You can do this without export/import workaround if, after positioning each hook in the Assembly room and making each a separate mesh, you then go to the VM room and copy/paste each hook into the master boot mesh, making sure to name each hook in the VM. Apparently, 3DS and DXF take their coordinates from the assembly room and OBJ takes coordinates from the VM. An alternative would be to convert each completed mesh into a primitive. I'm guessing that an OBJ export would take coordinates from the assembly room if you exported a group of primitives. (Though I have no direct experience with this approach.) SMcQ