We have a situation where we create part A that is cut and machined then sent out of house to be cut into six pieces creating three unique parts B, C, & D with a quantity of 2 each. Parts B & C are further processed to make parts E & F. Part D is combined with the parts E & F to create part G that goes onto be machined to make the final part H. We have setup parts E, F, & D as co-parts with Lot Sizing Multiple at 2 since Part A yields two of each part. Parts E & F only require 1 of each part B & C and part G only requires 1 of Part D. We do not have any operations on the job at this point only material. We run MRP and it generates three job suggestions for parts B, C, & D for a quantity of 2 each. MRP also creates job suggestions for parts E, F, & G for a quantity of 1 each. MRP is doing what we want by suggesting making two of each part, supplying 1 of each to the latter job, and stocking the other ones. We are wondering if there is a way to structure the MOM to get one job suggestion to use part A as the material with sub-contract operation to send it out to be cut into parts E, F, & D. This would be easier to manage than sending three separate sub-contract jobs out for one material.
A couple things we are playing around with is structuring the three parts into a phantom part and switching the three parts to purchased where we send the material to the supplier and they sell us the parts back.