This is a Virtuemart Modification that will allow you to have FULL control over your inventory based on the attributes. Currently virtuemart gives you the option to control your product in stock. But what if you have different sizes and colors? How do you keep inventory of how many Mediums or Larges were purchased? There are ways to use VM Product Types and Product Attribute to control this but it is a bit confusing and time consuming. HERE IS YOUR EASY ANSWER TO THAT PROBLEM: You enter the amount you have in stock for each attribute...eg. medium-2. After each sale the stock for that attribute is decreased. When the stock reaches 0 the attribute is removed from the drop down box on the front end, and cannot be selected or ordered until you have replenished the stock for that attribute.