What is an Invoice? How to create an Invoice? Can I share an invoice? Can I print an Invoice? How to add a product or service to an invoice? How to add a new section to an invoice? How can I create a sales order from an invoice? How can I create a purchase order from an invoice? How can I create a subscription from an invoice? Can I change the template of an invoice before printing it? What are the different Statuses in an Invoice?