Org Chart

I am creating a drill-down Org Chart of an organization with over 600 people
who reside all over the country . The first page is the CFO and her direct
reports and the subsequent pages are the direct reports and their staff etc.
I am using the custom properties field to capture the Office Location and to
generate a report of how many people are in each office. The problem is that
if a person exists on more than one page - then they are counted twice in the
location report. I can't figure out how to fix this. Any ideas would be
wonderful.....