In SimpleInvoices there are three types of invoices available:
Total Invoice: Think an invoice from a plumber that lists the actions and then has one price, associated taxes and a total.
Itemized Invoice: An invoice that list many different items. For example a grocery store invoice.
Consulting Invoice: An invoice that is similar to an Itemized Invoice except that with each line item there is a detailed description of the work performed/product sold. For example an invoice from an accounting or legal firm.