Ooops! My bad. Yes docFF should refers to all the formfields in the document.
Code:
Dim docFF as FormFields ' declares docFF as the formfield collection
Set docFF = ActiveDocument.Formfields() ' sets the object
Sorry about that. I am surprised Paul did not call me on that. I am even more surprised I missed it! Doh.
If you do go the field calculation route you are strongly advised to to listen to Paul and check out his Word Field Maths Tutorial. It is a few years old, but is still relevant and is still the very best learning source out there.