I often use the SUMPRODUCT formula in the following manner:

=SUMPRODUCT(--(OFFICE=$B12),--(REVENUE<""),--(REGION="1 - Canada"))

where... OFFICE, REVENUE and REGION are all 'Names' given to column ranges

I often, however, find that my data is structured in such a way that I could
really benefit from being able to use other formulas in conjunction with the
SUMPRODUCT format. For instance, it would be great if I could structure the
'REGION' section of the above formula to only have to look at the first
character (I'll attempt to demonstrate my thinking by way of the following
altered version of the above formula):

=SUMPRODUCT(--(OFFICE=$B12),--(REVENUE<""),--((LEFT(REGION,1))=1))

Is something like this possible?

Thanks in advance!