Our company manufactures garments. We make to order (MTO) and make to stock (MTS). I understand the stock moves for make to order. How can I set up an easy route for make to stock? 

When I need to replenish stock, I assume you want to start with a manufacturing order. This moves raw materials to production and then finished goods when the MO is complete. However, I would like to easily issue many MOs at once for size and color variants. The easiest way to do this is from a sales order/delivery order. But I am not selling to a customer so I don't want delivered goods to leave my stock. Should I just cancel the delivery order after my products are manufactured? 

Is there a better workflow that I have not found yet?