1. In My Reports, select the report, then click Edit report.
2. To edit the existing layout, click the Layout button, then click the Edit this layout in the layout designer button.
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5. Click the group header band and click on the > icon to open the Group Header Tasks dialog box.
7. Click Add to add a new group field to the collection.
In the Group Field properties panel, click the Field Name drop-down arrow and select the data field for grouping.
8. Click OK to save the grouping collection.
9. Optionally configure group header settings such as Keep Together and Repeat Every Page to control how the groupings are displayed in the report.