A report template specifies content and formatting for a report section.
If your report has more than one section, you can apply report templates to each of the sections (see Report Properties).
PowerDesigner provides a set of standard report templates that allow you to generate reports without any configuration (see Creating a report with a report template). You can also create your own report templates
Report templates are edited in the Report Template Editor, which is like the Report Editor except that it can only contain a single report section, and the right-hand pane is called Template Items.