I can create a list/set of customers who received a letter from us (call this Set A).  I can create a list/set of customers who responded (call this Set B).

 

I would like to create a list of those customers in Set A who are not in Set B.

 

I think this should be easy but for some reason I cannot figure this out.

 

Can someone please tell me how to do this?

 

Thanks.

Bill