Magento 1.9 – Remove Item from Admin Order Quote and Add New Item Programmatically

Instead of using a custom controller it's easier (and perhaps cleaner) to do this from a controller. So, we'll need to build a little module for that

config.xml

<?xml version="1.0"?>
<config>
     [...]
  <global>
     <fieldsets>
         <sales_convert_quote_item>
             <custom_attribute_column>
                 <to_order_item>*</to_order_item>
             </custom_attribute_column>
         </sales_convert_quote_item>
     </fieldsets>
     <resources>
         <[namespace]_[module]_setup>
              <setup>
                  <module>[Namespace]_[Module]</module>
                  <class>Mage_Sales_Model_Mysql4_Setup</class>
              </setup>
         </[namespace]_[module]_setup>
     </resources>
     <models>
          <[namespace]_[module]>
               <class>[namespace]_[module]_Model</class>
          </[namespace]_[module]>
     </models>
     <events>
          <checkout_cart_product_add_after>
               <observers>
                    <[namespace]_[module]_checkout_cart_product_add_after>
                         <type>model</type>
                         <class>[Namespace]_[Module]_Model_Observer</class>
                         <method>checkoutCartProductAddAfter</method>
                    </[namespace]_[module]_checkout_cart_product_add_after>
               </observers>
          </checkout_cart_product_add_after>
     </events>
  </global>
     [...]
</config> 

your setup script

$installer = $this;
$installer->getConnection()->addColumn($this->getTable('sales_flat_quote_item'), 'custom_attribute_column', 'varchar(255) NOT NULL');
$installer->getConnection()->addColumn($this->getTable('sales_flat_order_item'), 'custom_attribute_column', 'varchar(255) NOT NULL');
$installer->endSetup();

And the observer [Namespace]/[Module]/Model/Observer.php

class [Namespace]_[Module]_Model_Observer
{
    public function checkoutCartProductAddAfter($observer)
    {
        $item = $observer->getEvent()->getQuoteItem();
        $item->setData('custom_attribute_column', 'the value');
        $item->save();

        return $this;
    }
}

I have found the solution after long hunt.

Just passed products array to productGridAddSelected() method like below

order.productGridAddSelected(products);

products array must be like

products[product_id]= quantity;