title: Magento add product size and attribute inventory
body: <p>I think this is a common situation, I'm selling clothes and shoes and <strong>I need to have an option for sizes and attribute an inventory level for each</strong>.  How could I do that?</p>
  
  <p>Here is an example, I m selling shoes in sizes 41 to 45. I have 5 pairs of each except the size 45 which I only have 2.
  (Keep in mind that clothes and shoes don t have the same measurement options).</p>
  
  <p>Would be awesome if I could do it for all products in a category at the same time, even if that means having to go through the DB.</p>
  
  <p>Thanks.</p>