Billing Request through Sale Order

Hi,

The requirement is to create a billing request from Sale Order.

Initially projects kick starts with Sale Order created from SD with FG material and maintain the sales conditions. PS opens the sale order in VA02 and add SFG Materials which are billable, as the FG materials gets dispatched in SFG segments at various periods, and final FG takes shape at site.

Now we need to pick the SFG components maintained in Sale Order and generate billing request. How to go about with the settings for the same.

I have seen with other clients, that they create billing request from VA01 and open in "With Reference" tab and give the Order no and pick the SFG material for generating request. I know this scenario is done, but how to start the configuration is a problem.

Can anyone explore and provide clarification for the above requirement. Need your support at the earliest as our project is running short of time.

Thanks.

AM