Hi info778,

You can run the Sales by Customer Summary report and customize it by month to show worth 10-year transactions. Let me guide you how.

1. Go to Reports.
2. Type in Sales by Customer Summary in the search field and click on it to open.
3. Choose Custom and set the date fields under Report period.
4. Select Months under Display columns by.
5. Click on Run report.

Let me share these articles in case you want to customize and memorize reports in QuickBooks Online (QBO):

• Customize reports
• Memorize reports

Keep us posted if you need anything else moving forward. We'll be here to help.

@info778 

"sales for one month of the year for the last 10 years"

Unfortunately, there is no way to filter and run a report that shows sales for one month of the year for the last 10 years in QBO. You will need to download the Sales report by month as you need and work on the Excel spreadsheet.