The Postal Codes menu item is enabled if you marked the option to Use Postal Code Assignment in the Service Options window. See Choosing Service Options.
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Choose Microsoft Dynamics GP > Tools > Setup > Service Management > Lookup Setup > General > Postal Codes.
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Enter the postal or ZIP code number in the Postal Code field.
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You can assign a branch using the lookup in the Branch field.
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Enter the City, State, and Time Zone.
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Choose Save.