Go to the Chart menu, choose Source Data, select the Series tab, and click the Add
button. Select the cell range for the second series' Y values. If it's a line or
column chart, that's all you need. If it's a Scatter chart, also select the cells
for the X range.

- Jon
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Jon Peltier, Microsoft Excel MVP
Peltier Technical Services
Tutorials and Custom Solutions
http://PeltierTech.com/
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AYakos wrote:

I have made a bar chart containing actual dollars on the y axis and months on
the x axis. I would like to add a line to the same chart which would
represent estimated dollars on the y and months on the x to compare the
actual to the estimate on the same chart. Is this possible?