The Titan Multi-Site Warehouse extension allows you to manage several stocks on a multi-site installation. If you have multiple sites that share the same SKU between each store you will know the default system will only allow 1 stock quantity per SKU. However with this extension it enables you to have the ability to have multiple stock QTY for the same SKU. You can have one stock count for each website in your system. Install 1. Install Extension via Magento Connect Manager 2. Flush Magento Cache (System - Cache Management) 3. Log out then back into Admin Area to avoid any errors