Is it possible to add an alternate “on hand” or “available” or quantity column/field for each product variant? I currently enter 999 as the available/on hand quantity because we make most of our product to order and I never want a product to show as sold out. However, we have in-stock inventory and I want customers to be able to purchase variants that are currently in-stock and ready to ship. How can I go about doing this? These in-stock variants will be updated frequently.