Keep your online inventory up to date here. Subcategories help to keep your site easy to navigate. For example: Your main navigation tab (Category) may read 'widgets' while your subcategory under that would be 'painted', 'unfinished', 'round', 'square', 'new'.
Gives you more control over the backend of your shopping cart features such as setting shipping rates, tax info and custom checkout fields.
Allows you to choose which options are included in your shopping cart.You also have the choice of using your own customized buttons for the shopping cart process.