Someone has created a bar graph that charts 4 figures per year. Therefore,
there are 4 bars for each year as displayed across the X-axis.

Is there a way to make 3 of the bars stack on top of each other while
leaving the 4th bar alone (this behavior would be repeated for each year)?
By stacking I mean after 1 bar is displayed, the next bar will begin at the
top of the previous. Thus there would be 2 bars per year but one of the bars
would be the combination of 3.

Instructions would be helpful. Outlook 2007 is what we are using. Thank you.