In some organization the system is set up such that make to order creates a Draft manufacturing order with sale order quantity, this particularly helps the system to know the product requested by customer has to be manufactured with available resources.
At times there will be some organization who create a purchase order to other vendor to procure and deliver the product at their risk.
You can achieve both the functionality in Odoo for your business by following the navigation Purchase>>Products>> Products and then procurement.
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