You can enter Buy Shipping preferences for specific ship-from addresses using carrier prioritization.
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Click
Orders
> Manage Orders
.
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Next to an order, click Buy shipping, and then click Buy Shipping preferences.
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In the Carrier prioritization section, click Edit. A preferences page will appear.
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Drag the carriers you prefer from right to left into the numbered spots.
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If there is a carrier you prefer not to use, leave the name in the section to the right.
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Click Save.
Based on this prioritization, Buy Shipping selects the lowest cost shipping service your carriers offer that meet the required delivery date.