Need to Add invoices to users in "batch" mode.
I want to be able to create an invoice for a selected group of contacts.
This invoice is the same for all the group A.
but it changes the number of items for group B.

So all contacts in group A they each get:
-An invoice with a unique ID, with the same item, item description, value, amount X, taxes and notes.

Group B gets the same invoice but a change in the amount of items
-An invoice with a unique ID, with the same item, item description, value, amount Y, taxes and notes.

-Group C gets the same with amount Z of items.

Need to add invoice to this groups 2 times a year, maybe at a database level, create the invoice then copy that invoice to all recipients with selected ID

Any idea?