MS RMS in a fast food chain store

Hi, I?m thinking in implement MS RMS in a Store Chain of fast food (Hamburgers, sodas, fried potatoes, etc,) but I?m watching problems with the inventory management for example how do you control the tomatoes if every hamburger uses 2 slices or the lettuce leaves if you don?t know the number of each lettuce?. Someone can tell me how to resolve these problems?

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