How to group billing documents into a single invoice?

Hi,  I am trying to group a few billing documents into a single invoice but not using an Invoice List.

Does anyone know how to generate it?

For example,

I have invoice A with 2 items (X, Z and Y) and invoice B with 1 intem (X, Y).

I need to create invoice C with this 3 itens summarized with itens X, Y, and Z and their values summed (such as quantity, price, etc).

I already tried to create a new billing document and configured the copy control but when I generate the new invoice via VF01, it creates two new invoices coping data from the original ones.  It does not group the invoice, but splits/continues with 2 separate billings.

I added an image below to illustrate my scenario.

Any suggestion?