excel charting

[Texas Aggie]

how can i get a horizantal line at XX value to traverse a columns graph.
for example:
i'm charting widgets using vertical bars and want to add a benchmark line at
XX widgets.

thanks.

 

[Debra Dalgleish]

Jon Peltier has instructions for adding a horizontal line to a chart:

http://www.peltiertech.com/Excel/Charts/ComboCharts.html#AddLine