Adding a calculated ROW to a pivot table

[gianni_sacco]

Does anybody know how to add a calculated ROW to a pivot
table?

I have a pivot table that is returning totals at the
bottom, as it should, but I *also* need it to return that
total as a percentage of grand total, directly beneath the
total.

I've always done this free-form in the cells below a pivot
table before, but the size of this pivot is dynamic so
that's not an option.

Also--I'm using the pivot in Access, not Excel directly.

Anybody have any tips? Thanks!