With the By the Pound module, the ingredient form shows a section titled with your By the Pound name. Enter Price per Unit (the selling price per pound/unit configured for the module), Measure (per Unit) (how much of the ingredient's base unit one sold unit represents) and switch on one or more Show as ... toggles to place it in the right By the Pound group. Only ingredients with a Show as toggle enabled appear on the By the Pound ordering page, and the By the Pound filters in the Ingredients sidebar use the same groups.