I need to add custom multi selection option for admin purpose, like the ordered products currently available in which location warehouse. Its display like both inside of the order page and Sales->order-> Grid
//custom code $this->addColumn('warehouse ', array( 'header' => Mage::helper('sales')->__('warehouse'), 'index' => 'warehouse', 'type' => 'text', 'width' => '70px', 'sortable' => false, 'filter' => false, 'renderer' => 'Mage_Adminhtml_Block_Sales_Order_Renderer_Productatt', ));
But It display only Column Name, how can i display with values,
Note: After placing the order the admin manually select the warehouse right after its display inside the object.