How can I issue an invoice without customer's info required

Scenario: You run a retail shop. You issue receipt to walk-in customer.

(ex: like receipt we receive from restaurant/supermarket/petrol station...etc.)

1. On the  top menu bar and mouse over your profile then click on My Biztory.

2. Tick Enable receipt.

3. IF you always issue receipt, you can Use receipt as default layout.

(Or untick if you need customer's info in the invoice most of the time)

4. Select Simplified Tax Invoice when you are issuing an Sales Invoice.