You can rearrange the group headers displayed in reports. Before you begin, the data model must be in draft mode. For more information, refer to Working on a Draft.
To reorder group headers:
In the All Reports pane, expand the required component node.
Right-click the report that needs to be modified and from the available menu options, select Reorder Groups.
In the Group Order dialog, drag the groups to reorder them as required.
Select OK. The changes are reflected in the selected report.
Grouping, used in combination with group headers in the report design lets you design a report that displays information in a grouped manner. For more information, refer to Modifying the Grouping Parameters.