To do a bulk update of your landed unit costs:
Go to the Product View - Catalog page.
Click on the gear icon in the right hand corner
Select Upload Landed Unit Costs
Click Download to download a CSV template that is pre-populated with your ASIN's and existing landed unit costs.
Fill in the template and click on Upload!
Bulk Upload Do's and Don'ts
Enter landed unit cost in US $
Do not leave landed unit cost blank or enter characters for any rows - it will cause the upload to fail.
Save the file as CSV (not Excel)
Do not edit the column order; you can leave the product name and SKU empty if you add new rows. These 2 fields are only informational only and do not get updated.
You can remove rows from the file if needed