Start by looking here
http://peltiertech.com/Excel/Charts/...orzErrBar.html
Then here
http://peltiertech.com/Excel/Charts/...orzSeries.html
and
http://www.andypope.info/charts/averageline.htm

They may not be specifically for bar charts but the techniques are
applicable
best wishes

--
Bernard V Liengme
Microsoft Excel MVP
http://people.stfx.ca/bliengme
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"Sten77" wrote in message
...
How do I put a movable horizontal line marker across a bar graph?