Is it possible to use formulas or functiions in the chart "windows"?

I would like to plot some thing if it has an acceptable "value" but if it
equals false or zero I do not want to take up space on the chart. I am
trying to track 25 entities and if only 5 show up then I have 20 slots on my
bar chart that I do not want.

Basically, I only want to display the values for entities that have
significant data.
The data is from two pivot charts and I am trying to consolidate the two (in
a separate no-pivot table page) so that I can compare last year to this year.

I also want this to be as automatic as possible( only modify the pivot
criteria-same for both tables) . I could make this work but I may not be the
only one using this spreadsheet.
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MGOETZ
Mason,OH