Seprate entry for product into view cart page having same name, price & quantity

[sujit]

Hi,

I have
Joomla 2.5.9
Virtuemart 2.0.18a
PHP 5.3.13

I need Separate entry for product into view cart page when i add to cart same product having same name, same price and same quantity .but the virtuemart functionality is that when i add to cart same product at second time it show only one product and show quantity 2. but i need separate entry for each product having same price,name and quantity.   

Thanks in advance !

Sujit