There are a couple techniques:

http://peltiertech.com/Excel/Charts/AddLine.html

- Jon
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Jon Peltier, Peltier Technical Services, Inc.
http://PeltierTech.com/WordPress/

Advanced Excel Conference - June 17-18 2009 - Charting and Programming
http://peltiertech.com/Training/2009...00906ACNJ.html
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"Karen" wrote in message
...
I have a column chart that I created in Excel 2003. It plots percentages
for
each month of the year. The data ranges from 22% - 34%. I want to add a
line
for my threshold that will go across the chart at 18%. How can this be
done?
HELP!
Thanks, Karen