Using Excel 2010.
I have a bar chart that gives for 6 people of my team the "figures" per quarter. Thus x axis is divided into 6 equal part, one for each of the person. And within each part there are 4 vertical bars each representing the situation per quarter for the concerned person.
I would like to add a line (in this case only a horizontal line) to indicate the target to reach.
How could I add this line as a graph on secondary axis?
Many thanks in anticipation.