The customization I am looking for is to have Xcart upload all data required by FedEx Web Services so FedEx, not Xcart, can correctly rate, per my account specific rates, a shipment by FedEx Ship Manager and then return the results to the specific order in Xcart. I do not want Xcart to add the individual rates per box in a shipment. It will not be correct because it will not rate a shipment that qualifies for the FedEx Ground Multiweight program. FedEx Web Services can do this correctly.
A shipment is defined as the number of boxes in an order and the dimensions, weight & declared value of each of the boxes. These fields will have to be added to items and variants in x-cart.
Also required is the destination zip code & weather it is a residential or commercial delivery address. These fields will have to be added to customer profiles.
The following link to FedEx support may be helpful. [url removed, login to view]