Welcome and thank you for visiting the Community today, SteveMIn!

Currently, there's only one field for part numbers per item. Your workaround is to create the same item for each vendor. Example: Item - V1, Item - V2, Item - V3, and enter the part number in each of them. Or, you can leave the Manufacturer's Part Number field blank and add an item note listing each vendor’s part number.

Let me know if you have other questions about your items. Take care and have a good day!