Invoice consolidation

All,

This is a question going out to the billing experts.  I need to find out if anyone has built a billing extension that would consolidate invoices prior to AutoInvoice being ran?

I know that with standard functionality, you can have a grouping rule in AR assigned to the transaction types to group projects invoices together by the agreement number.  Working with a client who either needs to consolidate with the draft invoice process being generated or one the invoice is released prior to AR importing.

Let me know your thoughts.

Jodi