Product

Product item : The specific item that has a unique selling point that makes it different from other products.
Product line : The collection of items that are in a particular category or similar to each other, but still different in minor parts like colors.
Product mix : Variety of types of different items.
Product range : Both variety and similarity of items

Subway's product range is not too varied, as it is mostly focusing on sandwiches. However, subway still has some alternative menus, all within a specific product line. The variety within the Breakfast line and Flatizza™ line is less in numbers, compared to the Sandwiches line's.

As Subway's signature menus are the sandwiches, it would be a good marketing objective for them to market on their other menus. Also, they could increase the diversity of each product lines to provide more choices for customers.