For managing inventory consumption for menu item sale,

1. Define all Store Items that going to be used an inventory consumption in the menu item.

2. Define Menu item.

3. Edit Menu >> Price and BOM >> Inventory Consumption >> Bill of Material >> and select items from drop down of store items >> select the quantity that will be used >> then, ADD >> Save.

Once above setting is saved, Store Inventory will be deducted as menu items are sold in POS.