allow for 3rd party billing such as to a school district allowing multiple students on invoice

It is useful for billing to school districts. We want an invoice that does not populate to be submitted to insurance. Also to the abiltiy to put multiple students and totals on the invoice and create a total invoice page and then submit itemized per student on one invoice with the letterhead total invoice as many request. There should be a section in the patient demo with drop down for school district. yes we created one but when invoiced it appears for submission to insurance and becomes confusing when looking at unsubmitted invoices since they show up there.