You can enter Buy Shipping preferences for specific ship-from addresses using carrier prioritisation.
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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 prioritisation section, drag the carriers that 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 on the right.
Based on this prioritisation, Buy Shipping selects the lowest cost shipping service level that your carriers offer that meets the required delivery date.