Create Summary Report w/Detail Reports

Question

I have created a detail report (or tab within the document) that shows the monthly revenue per customer & calculates average monthly revenue per customer.  How can I create a summary report (tab within the document) that only shows the customer & the average revenue per customer (so it does not bring back multiple lines for each customer)?  This would allow my users a quick view of the average rev per customer and then could go into the detail to see the monthly rev per customer.

Answer 1

Thanks everyone, sorry for not being more descriptive (obviously I'm new to this!).  So in my document I have a simple table that looks something like this: 
Name               Contract Date           Month                  Revenue
John Doe          3/1/2011                   April 2011            $1.00
John Doe          3/1/2011                   May 2011             $1.00
                                                                 Monthly Ave:     $1.00  
Jane Doe          1/1/2011                   March 2011           $1.00
Jane Doe          1/1/2011                   April 2011              $1.00
Jane Doe          1/1/2011                   March 2011           $1.00
                                                                 Monthly Ave:     $1.00 
The monthly Ave is a simple calculation (=ave) that I added when I split the table.
What I'd like to do is have another "tab" (report) in the same document that summarizes that data to be something like this:
Name          Contract Date          Monthly Ave
John Doe          3/1/2011              $1.00
Jane Doe          1/1/2011              $1.00