The vendor part number is the same as the barcode field.

1. On the Inventory menu, select Stock Items, and the select Vendor Parts Update.

2. In Vendor, type a Vendor name or click the Select a Vendor button. 

3. From the Select a Vendor dialog box, click to select a Vendor.
4. Click the OK button.

5. Browse and upload new csv file to update item cost and package quantity.