Hello there, @AccountingGF.
In QuickBooks Desktop (QBDT), we can only create one vendor for an item. I'll guide you how:
- Go to the Lists menu and then click Item List.
- Select the Item drop-down arrow.
- Click New.
- Select the Type drop-down arrow, then choose item types.
- Enter the information needed.
- Click on OK once done.
You can also visit this article to learn more about adding vendors and items: Add and edit multiple customers, vendors, and items.
Feel free to browse this link on how to use alternate vendors: How to use alternate vendors in QuickBooks Enterprise.
Please drop a comment below if you have other questions. I'll be right here to help you out. Have a great day!