Here are some illustrated tutorials:

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

- Jon
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Jon Peltier, Microsoft Excel MVP
Tutorials and Custom Solutions
Peltier Technical Services, Inc. - http://PeltierTech.com
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"Fenil Shah" <Fenil wrote in message
...
Have created a column chart showing world GDP and World Merchandise
Exports(Annual percentage change) for the years 1995 to 2005. Want to
show
the average GDP growth (1995-2005) and average export growth (1995-2005),
both as horizontal dotted lines on the chart. How do I do it? I am using
Microsoft office XP pro.