This concept can solve very varied situations and of an easy and clear form. A grouoer is a concept that does that the physical impression of an invoice acquires a different form in accordance with the needs of the client, although ALWAYS (INTERNALLY), it remains inalterable, is more, if you repeat the invoice without the grouper it will go out printed with all the concepts initiate them.
In the example we see the AIR grouper, it will do that all the concepts that appear of ROOMS, SYSTEMS and the SERVICES of H=Room Rapel, 20=Minibar, and 55=Coffee Break groups them in the only concept calling him to the same ROOM