Multiple columns over a chart

D

Duncs

I have a sheet in Excel 2003 with a number of columns, all of which
follow the same, repeated pattern:

Day of week
Date (dd/mm)
Volume
Blank column

This is then repeated over each month. So, I have 4 columns for July,
August, September etc. Each of the months have their own individual
line chart, showing date / volume. What I want to do is display a
month on month, running total chart, i.e. the one line chart that
shows all volumes to date. However, I can't get this done the way my
data is stored. If I select multiple columns as my source data, the
sheet shows the one line for each month, when I want the one line for
all months.

Anyone help?

TIA

Duncs
 
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