One-Time Use Inventory Products are products that you have on-hand and want to sell to customers, but you do not want to consider them a permanent part of your Inventory and re-stock them when you run out. 

Notes:

• This feature automatically disables the product once it is out of stock.
• Backordering a One-Time-Use Product is not recommended as they are designed to be disabled and not re-ordered.

Enable One-Time Use Products

To enable this feature: 

1. Navigate to Admin > Inventory - Preferences.
2. Check the “Enable One-Time-Use Inventory Items” box.
3. Click Save.

Mark a Product as One-Time Use

If you enabled the One-Time Use feature, when you create a new Inventory item or modify an existing product, you will see “One Time Use” checkbox:

You will also see the "One Time Use" checkbox when adding a new Manual Product to a Purchase Order. Click Manual Add in the Purchase Order next to the "ADD 'MAINTAIN STOCK' PRODUCT FROM INVENTORY" box. 

You'll see the checkbox at the bottom of the pop-up window:

Check this box from either location to mark the product as one-time use.