Set Available to Advanced Partner field to True on Item records via CSV Import

Create a CSV file that contains the following information:

Item Name/Number or Item Internal ID
Available to Adv. Partner = set to Yes

A: Run the Import Assistant:

1. Navigate to Setup> Import/Export> Import CSV Records
2. Set Import type to Items
3. Set Record type to Inventory Item
4. Select the CSV file
5. Set Data Handling to Update
6. Map the fields accordingly:

Item Name/Number = Item Name/Number
Internal Id = Internal Id (Optional)
Available to Adv. Partner = Available to Adv. Partner

7. Give the import map a title
8. Click on Save &Run