Regarding Top 10 customers sales Manager wise

Regarding Top 10 customers sales Manager wise

Hello,

How to show top 10 customers Manager wise . I have row wise data customer and manager wise. But whenever i try to filter by top 10 rows , it shows only top 10 customers instead of Manager wise. 

I want to show data as below if suppose we have Manager A and Manager B :
Manager Name- Customer Name -Row Total
-----------------------------------------------------------------
Manager A -> customer 1 - > 10 
Manager A -> customer 2 -> 30
.
.
.
Manager A -> customer 10 -> 100
-------------------------------------------------
Manager B -> customer 1 - > 10 
Manager B -> customer 2 -> 30
.
.
.
Manager B -> customer 10 -> 100

 Please guide me for the same.

Thanks
Pritam