title: Woocommerce - Trying to get variable product quantity sum in admin
body: <p>as in title, i'm trying to get sum of my variable product (for each product) in admin instead of 'out-of-stock' or 'in-stock' indication. I've variable product so i need sum of one variation to get all my product (ive a pant in different size and different colour but i need only sum of all size). Anyone got this before me?
  Thanks in advance, Francesco</p>