Auto invoice grouping by Sales Order header item and multiple Sales Orders Header items

Summary

Auto invoice grouping by Sales Order header item and multiple Sales Orders Header items

Content

Questions on Receivables auto invoice grouping:

We have a client that has the following requirements:

1. For some customers, the customer will have a sales order and a packing slip that has a multiple child items and a header or summary line. The summary line represents an assembly or total of the items.  The items are set up in the Oracle item master. 

The client's customer wants a single line invoice for only the summary line from the sales order but the summary line should contain the total amount for the billing from all line items.  Is there a way to do this using Invoice Grouping Rules?