Hello there, @Suzanne181.

The steps provided above by my colleagues are for QuickBooks Desktop (QBDT).

In QuickBooks Online (QBO), we have the Purchases by Class Detail which shows all your purchases grouped by class and Sales by Class Detail that shows your transactions grouped by class. 

To run the report, here's how:

1. In the left menu, click Reports. 
2. In the Search field, type in Purchases by Class Detail/Sales by Class Detail.
3. Set the Report period. 
4. In the Rows/columns section, choose Group by Class.
5. Click Run report.

To learn more about how to run a report, visit these articles:

• Run reports
• Customize your reports in QuickBooks Online

If you need further assistance in managing your account, leave me a comment below. It's always a pleasure to help you. Take care.