I'm selling a product, which I import in packs of 1440 pieces. I split these up and sell them in bags of 100, 720, or 1440 pieces. Until now I have set these up as one configurable product with 3 options for number. But how would it be possible to keep track of stocks in the system?
If I have 1 pack with 1440 pieces, I need the system to show that if a pack with 100 pieces is sold, the 1440 pack is out of stock (because now only 1340 pieces left). Is it possible to do this in Magento? I don't want to make it a single product where people can type any number, because I want to sell only these 3 sizes of bags - not for instance 17 or 132 pieces.