This worked!! Thanx khagesh gupta
The other suggestions where valid as well but not for what I was looking for. In the Mobile app, when you show the catalog, you cant see the stock. You need to open the item for that, however you can add UdF. So I wanted to create a UdF with the stock but for that info to show in the mobile app it needs to be in the table, not just visible in the field.