Tables represent another option you have for showing your inventory. A supercategory of "tables" has been defined with subcategories of banquet, training and miscellaneous. (The supercategory name, Tables, becomes the clickable link in the category list.) When you clicked "Tables," you were shown the three defined subcategories: Banquet, Training and Miscellaneous. If you click "Banquet," you will see that the category has been further divided into subcategories of "Rectangular" and "Round" tables.