Jon Peltier has instructions for conditional charts:
http://www.geocities.com/jonpeltier/Excel/Charts/format.html#CondChart
> Hi,
> I am putting together a bar chart and thought it would be a nice touch
> to change the colour of the gridlines to represent threshold markings.
> ie. 10 - 50 = green ; 60 - 80 = Amber ; 80 and above would be red.
> Is there any way I can individually colour the horizontal gridlines as
> the only option I have at the moment is to colour all the same.

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Debra Dalgleish
Excel FAQ, Tips & Book List
http://www.contextures.com/tiptech.html
Jon Peltier - 21 Nov 2003 18:17 GMT
To create individually formatted gridlines, check out this page:
http://www.geocities.com/jonpeltier/Excel/Charts/axes.html#ArbGrid
which uses error bars on a dummy series to provide the actual gridlines.
Skip the use of crosses as points and data labels for axis labels if
these are satisfactory in the original chart. You need a different
dummy series for each differently formatted set of gridlines.
- Jon
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Jon Peltier, Microsoft Excel MVP
http://www.geocities.com/jonpeltier/Excel/index.html
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> Jon Peltier has instructions for conditional charts:
>
[quoted text clipped - 6 lines]
>> there any way I can individually colour the horizontal gridlines as
>> the only option I have at the moment is to colour all the same.