Standard Reports
Commander4j comes with a great many "standard" reports which can be accessed via the "Print" button on many of it's screens.
These reports are created using a 3rd party library called Jaspersoft community edition
You can modify this reports if you use a application called JasperSoft Studio JasperSoft Studio.
All the reports can be found in the "Reports" folder. See Folder Structure. Make a copy of this folder and work on the copy.
The safest approach is to make a duplicate of the report which you want to modify and work on a renamed version of the file. When your happy with the changed you can copy the new report.