See Modify Standard Reports Overview for reasons why you may want to save a customized standard report as a new report.
You can only save a standard report after you have modified some of the options. You can tell that report options have been modified by looking at the Report Form (Reports tab) Options column to see if an options name or <Options Selected> displays.
You can only save duplicate personal report names in the same report category (Cost Analysis/Workflow/Progress/Schedule) if you are using different user names.
All users saving global reports must use a unique report name if saving a report in the same report category.
To save a modified standard report as a new report:
In the Navigation menu, click Reports » <Report Category>.
On the Reports tab, select the report you want to save as a new report.
In the grid toolbar, click Save As.
In the Save dialog box, enter a name for the new report and click Save.
The report is saved in the ...reports\custom folder on the application server and added to the reports grid as a personal report. No other user can view this report (even as a report dashpart) unless you use Access Control to grant other users access.
You can see the location of the reports folder in the Location of Reports on Application Server field on the Load Reports tab in Administration » Report Administration.
Modify options for a standard report