If you buy bottles of wine from your supplier, you can easily store them in your warehouse with the storage function. In the case of selling wine for glasses, it is necessary to set the conversion of units from pieces to litres in the stock card. If you know that one bottle of wine has 0.75 l, state this number in the conversion of units and then state the number 0.2 l in the recipe, ie the volume of one glass. Even if we stocked pieces of wine bottles, the glasses will be deducted in litres.