How do I create a part model "machined.prt" using a portion (25 mm of 250 mm bar)of bar-stock.prt Model (Extruded bar) as material. I want the Stock model drive the machined part profile. I also need to report in structure
I would suggest you look into inheritance models. This is exactly what they were setup to do.
It can be done in many ways. Please refer tutorial suggested by Christopher/hit on link