It is best if the value is contained in a custom number column (number1,
number2...) instead of a text column (text1, etc).
Use the customize feature (right click on the number1 colum and select
"Customize Fields". There are several areas on the form. One area deals
with a formula for the individual descrete tasks ... leave that blank.
Another area (immediately below) is how to deal with summary tasks.
In the section for "Calculation of group and summary rows" select the option
for Rollop and select "Sum" from the drop down.
This will work if the custom field is a number. If your custom field is
text, you will need a solution using VBA Code (a macro). Probably easier to
make sure you use a number column for your custom field.
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Jim Aksel, MVP
Check out my blog for more information:
http://www.msprojectblog.com