Is it possible to add a "dynamic" field to a Pivot Table?

For example: I have two columns A and B. I want the dynamic field to
show B-A. More specifically, I'd like the Delta (B-A) column to show
the growing total of the difference.

A---B--Delta
0---1----1
3---4----2
0---0----2
1---1----2
1---7----8
2---3----9

I know a database would be better for this, and I know there are
options with VB scripting; however, just assume neither of those can be
done.

Thanks,
JC


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