Allow for creating sub-items under generic items

For example under the Soup item:

Soup                             +
    Chicken Noodle       1
    Tomato                     3
    Vegetable                 2

Let me explain the above example. Using the new functionality of adding sub-items to an item, when the person adds a sub-item under Soup, the number of items for the generic Soup turns into a plus symbol to show that sub-item(s) exist under the category Soup. The person can add the number of items per each sub-item. In this case, one can of chicken noodle, three cans of Tomato and two cans of Vegetable.

This would allow for adding specific items under a generic item.