thank you , that works great . each line has an order for a part ( assembly) with a date for when it is going to be completed , each assembly has a bill of materials . the system looks at all the parts for the next month and collates all the materials to purchase . these materials are bought to stock the only way i knew of is to tick that box so it dont order them parts over and over again . not great but i did not know of any other way , albeit it works
steve