RE: subtotals
Hi John,
It works as you expect:
=PRODUCT(SUBTOTAL(2,$D$15:$D$2169),SUBTOTAL(1,$D$15:$D$2169))
will multiply the count of a field by the average of a field of a filtered database - effectively giving the answer you would have achieved with
=SUBTOTAL(9,$D$15:$D$2169)
It would also work across 2 different databases, if you were applying filters to both. Remembering where you were with each filter might be tricky though...
Hope this answers the question!
Clare Glover