How can you rank the customers? I would like to know my top spenders, then the next ones and so on.

Hi george23,

Thanks for posting in the Community!

You can run a Sales by Customer Summary or Sales by Customer Detail report to see the top spender. Let me show you how to generate this report.

1. On the Reports tab search for Sales by Customer Summary or Sales by Customer Detail. 
2. Set the Report period and Accounting method you prefer.
3. Select Run report. 
4. If you would like to add or remove columns to show on the report, you can click on the small gear icon.

For your reference, you can also check this article: Customise reports in QuickBooks Online.

Feel free to post again if you have any other questions, we're here to help.