With shipping upgrades, you can offer your buyers more shipping options. A buyer can choose the option in their shopping cart when they check out. To enable shipping upgrades:
How much buyers are charged for shipping upgrades
When adding shipping upgrades, you can enter either a Domestic upgrade, an International upgrade, or both. The price of the upgrades is completely up to you and can be as little as $0.
The cost you set for a shipping upgrade is added to the base shipping cost you set. Your buyer will see the total of both amounts along with the name of your upgrade in their cart.
In an order for multiple items, if a shipping upgrade is available on one item, it will be available for the buyer to select. Its costs will apply to every item in the order, even those items whose shipping profiles don’t offer the upgrade.