How do I add a gridline in an excel chart with a custom value?

[jbigelow]

I want to add a gridline on a chart that shows a custom value, but I can't
figure out how to do it. Any help would be appreciated. Thanks.

 

[Andy Pope]

Hi,

You will need to create your own custom gridline for a specific value.
http://peltiertech.com/Excel/Charts/AddLine.html

Cheers
Andy