Hello:

Are you looking to produce invoice documents that can be sent to Customers? Would it be a form with addresses, product/services, prices, taxes etc?

If so, there are 2 modules that are commonly used for that purpose: Adagio Invoices or Adagio Order Entry. Both produce invoice forms to be sent to Customers, either by email or on paper.

What are trying to achieve and do you bill for products or for services?