Add a line to an chart

[Gandalf]

Hi

On the attached workbook I would like to add a line to the Cost chart (Charts sheet) which corresponds to a cell value (cell J2) in the Readings sheet. I have tried numerous ways from recommendations on-line but cant get any to work. This is probably very easy but like a lot of simple things it seems to be more complicated than it looks. Thanks for any help

 

[vletm]

Gandalf
Here one quick four Your line
and
Another sample for Your monthly chart.

 

[Gandalf]

Brilliant, thank you. Now why couldn't I do that?