These items have a security level set to be seen by POS users only.
E-commerce > Select the category you want the product/service charge to appear (if applicable) > Add product.
Enter the product details as per usual. The security setting will automatically be POS only.
You will note here you can adjust the Qty Increment for labour charges etc that may need a different approach than just a whole number.
Press Add Product when finished.
Publish