You want to move a characteristic in the rows to a different position - in this case, to between two other characteristics.
In the analysis grid, use drag and drop to drag the characteristic Product Group to between Calendar Year/Month and Distribution Channel.
You can also move the characteristic Product Group in the navigation pane by using drag and drop to move the characteristic to between Calendar Year/Month and Distribution Channel in the rows.
The analysis grid is updated accordingly: Product Group is in the drilldown and is displayed along with its data in the rows between Calendar Year/Month and Distribution Channel.