Massupdate of stock, manage stock

[red2012]

Hi, i have product that are the same but for different cars, so i have them as different product in different productscategories.

 

Does anybody know if there is some way to have all this prodcut connected with eachother so that if someone buy from car 1, ten the stock will change in all categorie, ex car2, car2, car4 that has the same product.

 

Ez, car 1, car2, car 3 has a product with referensnumber/productnumber: 123

 

They are all the same product, but shown as 3 different product in the web beacuse they fit different cars, so they are in differents productcategory.

 

So i am looking for a modul or something where i can handle stockupdates, and so thay are all connected,

 

Ex: Stock for car 1, car 2, car 3 is 4 pcs of :123

If someone buys ex. 1 pcs for car 1, then all the stocks for car 2 and 3 will also show 3 pcs, they are all connected. The same for me when i want to fill up the stock, then i only fill upp artiecle 123, and they will automatic been shown for all cars (so i dont have to enter each model to fill up, and to take one of when 1 of them is sold)