I know there must be a relatively simple solution to my challenge, short of
creating a new series od data which is the sum of desired series.

Let's say that I have the following

02/13/2010 02/20/2010 02/27/2010 ...
0-30 $7,072,987 $5,990,448 $8,978,002
31-60 177,472 160,460 142,547
61-90 24,976 25,644 2,413

Rather than tracking two series (0-30 and 31-60) as two separate series on
my graph, I would like to track a NEW series called 0-60 which is the sum of
these two series:

02/13/2010 02/20/2010 02/27/2010 ...
0-60 $7,250,459 $6,150,950 $9,120,549
61-90 24,976 25,644 2,413

So how can I do this simply within the chart, without needing to do all of
the summation separately?

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MJ