create one p.o with multiple other charge items generated by work orders

Bill of materials have a tolling line which we use to place tolling service p.os to our contract manufacturers when creating a work order. We have different “other charge items” set up to use as the tolling line depending on the service. When the workorder is created it generates a purchase order for that assembly. Problem we are running into is that when sending over p.os we have to send over separate p.os as opposed to generating 1 p.o with the other charge items as part of the p.o lines. We do not want to lose the connection to the