Hello again, Roberto Verde.

While we're unable to show the class on a split transaction in the Account QuickReport, you'll want to export the data to Excel. Then, manually edit the information.

Here's how:

1. Go to Lists > Chart of Accounts.
2. Right-click on the account you want to view, and select QuickReport.
3. Click the Customize Report button and add the Class column.
4. Choose the Date and select the Excel drop-down located at the top.
5. Select Create New Worksheet.
6. In the Send Report to Excel, select Create new worksheet or Create a comma separated values (.csv) file.
7. Hit the Export button.

I've got this article for reference: Export reports as Excel workbooks in QuickBooks Desktop.

You can also memorize a report by following the instructions in this link: Create, access and modify memorized reports

If you have more questions or other concerns, please let us know and we will get back to you the soonest. Thanks.