To add a new professional stock item, click on 'My Business' and then on 'Professional Stock':

Click on the '+ Add Professional Stock' button, input the stock details, and click on 'Add Stock':

Stock Code: This is the code that is often given by the product supplier.
​Stock Name: The name of the product.
​Stock Category: This is usually the supplier name, but can be anything you choose. If you want to add a new category, click on the '+' icon.
​Inventory Level: The current inventory level you have in stock. This will either be in units or mL.
​Cost Price: The cost price (including tax) per unit or mL.