Custom Sales Report is the report that you can create with your required fields.
And you can save this template for future reference.
Go to Sales >> custom sales report.
Select the date range or you can ignore this option.
Select the required fields from the drop down.
Click the view report button.
The report will be generated.
You can save this template or future reference by clicking the save button.
If you want to generate a report from the saved template you can choose from the saved template drop down.