To update Assembly Items and the Preferred Vendor field:
1. Enable Multiple Vendor feature: Setup > Company > Enable features > Items & Inventory > Multiple Vendors = True
2. Run the Import Assistant: Setup > Import/Export > Import CSV records:
- Import Type = Items
- Record Type = Assembly/Bill of Materials
- Data Handling = Update
- Map the fields:
- Internal id = Internal id
- Vendor name = Vendors 1 : Vendor
- Preferred = Yes
3. Set Mapping name.
4. Click on Save and Run.
5. Refresh CSV Import Status until completed.
6. After the update, check any assembly item to confirm if a vendor subtab under the Basic tab will appear with the Preferred Vendor name.
Note: If users want to see it under the Basic tab, go back to Setup > Company > Enable features > Items & Inventory > Multiple Vendors and unmark it.