I have a list of referring md's for a 2 yr period. In Col A ref md (2005)
Col B #of referrals, Col C ref md (2006) Col D #of Referrals. What i would
like to do is to combine Col A & C and sum B & D. The issue is that Col A & C
do not contain the same doctors. If Col A & C were the same then it would be
sum b & D.

Thanks

Brad