To obtain SKUs from your Sears store:
From within Sears Admin, click Products > Browse and Edit
Select a category and click on Load Catalog
Click on Edit
Click on Offers. The Item ID field represents the SKU number that will be managed in the fulfillment center warehouse.
Note: Once a SKU has been defined for a product in the Sears store, it cannot be modified. To assign a new SKU, it is necessary to delete and re-create the product with the new SKU number.