Good morning, @richard49.
 
The products in your QuickBooks account can't be deleted only made inactive. By making them inactive, you won't be able to see products in your list, and you'll be able to re-upload the file without any duplicates. Making the product inactive takes a few clicks:
 
 - Go to the Invoicing tab and choose Products and Services.
 
 - Select the checkbox above the list of all your products and services.
 
 - On the right-hand side, click Batch Actions.
 
 - Pick Make Inactive and in the pop-up box press Yes.
 
Now, your products are inactive, and you can upload your correct formatted file. The information in this article about importing products and services will help you with the importing process.
 
If you have any other questions, feel free to comment below. Wishing you continued business success now and in the future!