Need to delay contracts creation upon shipment, based on cust accept/ rejection of line on Order

Hi Team,

We know that contracts gets created upon shipment of item from stand alone order ( assume Shipped BOM has warranty item in its Bom).
The contracts/ warranty can be seen in the installed base (IB) , in the contracts link of an IB instance.

We are also aware of the fact that in Order management we have the facility in the ship and Bill line , where in the customer is given facility to accept or reject the billing post the shipment.

Pl suggest how the below can be accomidated :
Current behaviour observed:
1> shipment done on the ship and bill line.