Ideal amounts help define the preferred quantity to keep on hand for each product by entering a number directly in the Ideal field on the Product List. These amounts support inventory planning and may be set using sales data from views such as Products Sold by Month or Customer Product Usage. Ideal quantities can also be estimated based on past sales.
From the main toolbar, select 
Inventory (or from the Product menu, select Product List).
Add the desired quantity directly into the Ideal field, then press the arrow or tab key to save.
Additional Information:
To help determine your ideal inventory amounts: