Select at least one Y column of values (or a range from at least one column). If there is an associated X column, X column supplies X values; otherwise, sampling interval of the Y column or row number is used.
Select required data.
From the menu, select Plot > 2D: Bar: Stacked Bar.
Click the Stacked Bar button on the 2D Graphs toolbar.
BAR.OTP (installed to the Origin program folder).