I have a group with six details. The final detail contains a field that's suppressed except in once instance. I need a way to grab a numeric quantity appearing in a previous instance of the group and pass it to the instance of the group in which the field is not suppressed.

In print, it looks something like:

Area 1
Quantity = 4

Area 2
Myfield = 100

I need Myfield to equal 400.