title: Opencart Set default tax class to all items
body: <p>I am working on a Opencart project and it is for Australia customers. So I have to set GST 10% to all items. The items are already added to the cart and I figured a way to add tax classes and I added it to a product and it works good.</p>
  
  <p>The problem is the catalog has more than 10000 products already and I need to update tax classes to all the products. I knew we can run a query to do that but my question is "Is there a way to set a tax class to default" Please let me know. Thanks</p>
  
  <p>My Opencart version is 1.5.1.3</p>