I have the following sumproduct formula

=SUMPRODUCT((Opp_Detail_Date=B5)*(Opp_Detail_Date <B6)*
((Opp_Detail_Name=Index!B2)+(Opp_Detail_Name=Index !B3)))

Opp_Detail_Date and Opp_Detail_Name are named ranges.

I want to extend this part of the
formula "((Opp_Detail_Name=Index!B2)+
(Opp_Detail_Name=Index!B3))" so that is calculates the
results for the range Index!B2:B73.

There has to be a better way of doing this then adding "+
(Opp_Detail_Name=Index!B14)" etc 71 times.

Any suggestions?

Thx
Lee