I use a helper column and use that as the source of the graph.

The helper column contains a formula like:
=if(a2="",na(),a2)
(and drag down)

(I'd hide the column if it's irritating.)

DoubleZ wrote:

I have created a graph in Excel 2007 that has 4 data series. However, in
many instances I will only have data entered for 1 or 2 of those series.
Currently, the blank series are being plotted as zero values.

Is there a way to define the data series so that if they are blank they will
be completely omitted from the graph?

--

Dave Peterson