Thanks for chiming in on this thread, amyp.

I'd like to suggest a report that you can sort by item, qty, and amount of sales.

You can run the Sales by Customer Detail. This report will tell you what the total sales for each customer. 

Here's how:

1. Go to Reports located at the top.
2. Choose Sales > Sales by Customer Detail.
3. Select the Date, and choose any option from the Sort By drop-down list.

I've got this sample screenshot for a visual reference:

Furthermore, you can check these articles to learn more about the reports in QuickBooks Desktop and how you can customize them:

• Understand reports
• Customize reports in QuickBooks Desktop

If you have any additional questions about the report I've suggested or need help with other concerns, please let me know by adding some details in your reply. I'll be around to help.