In addition to changing headers and labels, you can make changes to the data cells in a table. To make a change that will apply to all the cells, use the Table Properties window.
To modify an existing report, right-click the Summary Tables task icon in the Project Explorer or Project Designer and select Open. The Summary Tables window will open. Click the Summary Tables option in the selection pane on the left to display the Preview area.
To make changes to all the data cells of a table, right-click anywhere in the Preview area and select Table Properties from the pop-up menu.