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 the Vendor box, 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.