populate scroll list columns from combo box

Dear all,
attached is a file , i found in a web site for a dashboard for kpi' s
in the original file the 10 products (with a scroll bar to show the other products) sorted according to the selected kpi ,and there is no areas ,now i add a column for areas each area have some products, and i add also a combo box in the dashboard for areas ,what i want is the same ability for sorting and scrolling for each area ,(to select the area from the list then the scroll bar rows populated by only the selected area and also the kpi's.

thanks in advance