1. Navigate to Receivables and click on Invoice
  2. Click on Create and select Create Invoice
  3. If an item is pre-added, then select the Item from the list or else you can 
  4. Fill in the other details, such as Discount (if any).
  5. Click on Save and Continue.
  6. Click on Approve.
  7. Select the mode of payment you want to share with your customer to make the payment.
  8. Click on Send Invoice.
  9. You can edit the template if required and click on Send