The invoices produced by nBill are template-driven. It is therefore possible to format your
invoice to get whatever look-and-feel you want, and you can use a different template for
different vendors if you are making use of the multi-company feature.
Invoicing templates should only be created by PHP developers. If you do not know PHP, you
will have to either use the default template, or get a PHP developer to create a new template
for you. Full instructions for creating an invoice template are in the comments of the default
template file (/components/com_netinvoice/templates/default/index.php)