Interactive alv

Hi,

I have developed an interactive alv in which the first list shows the details of customer(KUNRG) and its order number (AUFNR).

Now for one customer there are multiple AUFNR.

When the user clicks on any AUFNR, i should be able to select data on the basis of selected field of the first alv.

i.e the select query for my secondary alv should be :

select vbeln aufnr prctr 
from vbrp
where aufnr  .............????????

likewise i want to do it for KUNRG?

Thanks in Advance.

<b>Rohitaash</b>