You can use multi units feature in Moon Invoice by following the steps below.

1. Open the Moon Invoice application on your device or tap on this link.
2. From the Dashboard, navigate to Items ➜ Products.
3. Click the ‘+’ icon to create a product or select an existing one.
4. Click the Edit icon, then under Quantity, select Type: Standard on the right-hand side and change it to Multi Units.
5. Lastly, click Save to apply the changes.