Excel Charts - Adding Lines Without Adding aColumn of the Same Data

[Quonset]

Version: 2008
Operating System: Mac OS X 10.5 (Leopard)
Processor: Intel

I want to add straight lines to my charts (e.g., an elevation line such as ground surface) without having to add a column with the same number everywhere. How can I do this?

Thank you.

 

[Bob Greenblatt]

Version: 2008
Operating System: Mac OS X 10.5 (Leopard)
Processor: Intel

I want to add straight lines to my charts (e.g., an elevation line such as
ground surface) without having to add a column with the same number
everywhere. How can I do this?

Thank you.

What's wrong with adding another series with the same values? This is the
usual way to do it. Have you tried the drawing tools to draw a line on the
chart?