Daryl, You can use almost any existing model for your WORKPIECE by assembling it as such into your MOLD/MFG session by conventional assembly techniques (mates, aligns, etc.) ASSEMBLE/WORKPIECE -> browse to model... It should be the first or second model assembled interchangeable with REF MODEL which need not be placed automatically either. The trick is basically to tell it (the software) what your assembling before you do it. (WORKPIECE, REF MODEL, MOLD COMPONENT, etc.)