These would be used if you wanted to further subdivide your zones. For example, if you have a frozen foods zone and you wanted to divide that down to the different types of frozen foods. You might have Frozen Vegetables, Frozen Pizzas and Ice Creams as possible subdivisions.
By doing it this way you can make sure that all frozen foods are picked at the same time through a wave template, but also allow the work to be broken up by type of Frozen food.
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