Bill to and Customer Separation

Hi there!

Im looking at setting up invoicing for NDIS participants.

I want to invoice to a Plan Manager, Coordinator ect.

but have all the clients name, details, NDIS ID ect on the invoice
This would be really easy if I could put multiple cards on the same invoice.

A few things have worked. Using address lines ect to enter these details.
Putting some details into the Ship to and Bill to seperately on my custom invoice.

But the problem i run into is I want the main name go to the company.

But if 1 client has 10 clients, i cant bill for those seperate clients easily. 

I hope this makes sense.

Edit: Added a image from the internet of what i'm making/made. and i want completely autofilled by sales.