connect Customer Order to Purchase order

Dear community,

I am using use Customer orders with line supply code Purch Order Trans.

What I would like to do is to connect the customer order with an existing purchase order.

This can be achieved with regular functionality, however, despite I can connect customer order with an existing Purchase order Header, the result of the opération is always the creation of a new purchase order line inside the purchase order.

Is there a way to connect directly the customer order with the existing Purchase order header an Purchase order line?

Best Regards

Rémi Lheure