Thank you MaryAnne.  I have gone through then entire process of creating the bill for the import expense, applied these expenses to the  bill that contains the product using the "Calculate Landed Cost" button on the bill for the product, and paid both bills.  All seemed to function as expected, except that now we have this balance in the "Inventory Offset Account" and I cannot trace where this comes from:

The yellow cells are the expenses that were entered under the bill for freight and are resulting in a negative balance in this account.  How can I trace where these expenses are coming from as I don't think that neither the freight bill or the product bill point to this account.