Shipping rule for "actual" Delivery Costs after shipment

Some of my deliveries are by courier, and I get to know the final cost of delivery after the courier has picked up the item.

The cost of delivery is including in my product cost.

How can I add this delivery cost to my costing when finalizing the invoice, without adding the cost. E.g.

Invoice value: 1,000
Delivery cost: 90
Total invoice value: 1,000

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