I set a POS system for retail. I need to configure the POS system for this case :

I buy a mineral water from vendor only in Box UOM. I box contain 24 botle. I would like to sell mineral water per Box and per botle with their own prices (the price for botle is higher then price per box / 24). Each botle and Box has their own barcode, and I will be use as input for the POS system.

I also want to see each stock qty for both of them (qty per Botle and per Box). If the botle qty stock is less then zero, it can automatically add the stock from the box stock (add 24 botle for each box) and the box qty also reduced automatically. When I make purchasing, I only purchase in Box UOM from the vendor.

How can I manage this?

Johan