The order in which Microsoft Graph plots data series in pie and doughnut charts is determined by the order of the data on the datasheet. Use this procedure to "rotate" slices within the 360 degrees of the pie or doughnut circle.
Click a data series in the pie or doughnut chart you want to change.
On the Format menu, click Selected Data Series, and then click the Options tab.
In the Angle of first slice box, type a value between 0 (zero) and 360 to specify the angle at which you want the first slice to appear.