1. How does the invoice option work? 2. How to create an invoice? 3. How will tax be calculated on each item when I invoice my customer? 4. Can invoices already sent be edited? 5. How will sales from my e-commerce sales channels be synced into my accounting software? 6. How can I add a sales person to my sales orders? 7. How I can assign a separate location, store or department on each invoice? 8. About Classes, Tracking Categories and why use them? 9. How do I record the terms and conditions of sale in my invoice? 10. How do I monitor the status of my invoice? 11. How I can track and record payments made by my customers? 12. How I can track and mark shipped invoices? 13. How can I grant discounts? 14. How to search for and filter invoices by specific product?