The below steps shows how to create a bill.

1. Click Quick sale from the Menu bar
2. Enter the customer name/number in the Customer column
3. The Name and Number will show in the drop-down for the existing customer, if it's a new customer it will ask you to fill in Add customer and enter the necessary details.  
5. Select the services/product/package/membership/Gift voucher and choose the from the corresponding label and choose the Staff.
6. You can provide the discount by value or percentage under overall benefits
7. Choose the Payment mode with a single click ( cash, card) from the payable amount
8. Click Checkout/sale to raise the Invoice.