No, Grosh will normally do this automatically. It is always good to ensure the category is correctly set when adding new types of groceries, and correct Grosh if the app makes a mistake. Correct categorisation will give you a correct grouping of items on the shopping list. This helps you clear all dairy products whilst you are in that area of the shop, then move on to the next area to get the grocery items related to that category. This will make you a more effective grocery shopper!