The resulting DataPilot table can contain many different entries. By grouping the entries, you can improve the visible result.
Select a cell or range of cells in the DataPilot table.
Choose Data - Outline - Group.
Depending on the format of the selected cells, either a new group field is added to the DataPilot table, or you see one of the two Grouping dialogs, either for numeric values, or for date values.
The pivot table must be organized in a way that grouping can be applied.
To remove a grouping, click inside the group, then choose Data - Outline - Ungroup.