pmegan is correct. Copy the report you want to start with from the system reports to reports\custom (this is for 80 column reports). Then in POSCFG go to Reports\Report Templates and create a new template (above 10,000) and link it to the report you will customize.
The trick is to look at this report and in SCJVIEW (the Sybase DBMS) create a new view and link this report to use this report.
Reports\Report templates also shows whether a report is visible in Autosequences & reports.
Alternatively you could create an SQL script, set it up as an external program, and create an autosequence to run it, and write the result to a file.