Combo Box Query

Hello, I have a query about Xcelsius combo box. I have data in the following format:

CustomerGroup Customer
A                              101
A                              102
B                              105
B                              106
B                              110

C                              108

D                              109

E                              107

I want to create a combo box, for customer group and second combo box for customer. if some one click on Customer Group A, Customer 101 and 102 should show up. Another example: Customer group B, 105, 106 and 110 should show up.

Once user selects a customer, i have data in 2 rows which I want to show on Column chart.

I think I know how to derive combo boxes with eachother responses but the main question is how do i show 2 rows of data on column charts, so how to get customer 101 to do the search in 1000 rows of data and pull out 2 rows (it will always be 2 rows) and show on the column chart?

Please help.

Thanks.