Having different Job Qty complete with different operation for Serial Track Parts

Hello, just wondering if anyone have this scenario where a part need to be cut split/cut in a different Operation? if so, any suggestion how to set it up?

Op 10: pack with Qty 3
Op 20: Subcontract Qty 3
Op 30: Cut the part into Qty 20
Op40 inspect Qty 20

Can we change our Qty complete for the job in midstream like this?