Login as the business owner or staff member and navigate to the "Invoices" page underneath "Clients".

Click the top right "Sell Product" button.
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Fill required fields - Client and Location. Then select the Product(s) you want to sell.

Proceed with doing the invoice as usual. You may edit the price of the product, Adding tip and Taxes, and providing discounts. Add an internal note or public note to be visible on the client's invoice. Or continue with "Pay".
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Select the Payment Method and complete the transaction by clicking "Charge".
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Your done adding a product without a booking and completing the invoice.
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