Thanks for posting here again, @Bill Lee 1,

Have you added this item already in QuickBooks? It looks like the quantity you're importing is more that what it set in the item.

You will need to edit the Max field on the Item List. See this:

For the complete process of the Advance Import, see this link: Import or export MS Excel files

Otherwise, you can use another option to import the data. Here's how:

1. Go to the File menu then Utilities.
2. Pick Import then IIF Files.
3. Use the Import it for me. I'll fix it later link at the bottom.
   
4. Once done, press Import IIF.

Kindly update me on how it goes. I want to make sure you're able to update your items in QuickBooks. Have a good one!