The use of Pro / Engineer software, a "spare parts - sheet metal" and "spare parts - entities" module's modeling capabilities, combined with sheet metal part and mold design specific requirements, you can quickly and accurately complete the sheet metal part and mold design and the commencement of part blank, and then use the software "analysis / measurement" and other features, you can easily calculate the size of the commencement of part blank. This method is suitable for all types of sheet metal parts and mold design, versatility, simple and easy. Moreover, using Pro / ENGINEER to design models of parts and molds can also be used for CNC machining NC program generation.