merging lists
 

I am trying to merge sales lists I run each month onto a master list. I run
a report that gives me customers in column A and sales amount in column B.
From month to month the customers may change, so I need to add a customer
that showed up in Feb that may not have been there in Jan, and also to bring
in the sales amount for all the customers. So I start with customers in
column A, Jan sales in column B and then add Feb sales in C and so on. Is
this possible in Excel?
--
Juan