Magento : Add Fixed price to same Product for a Multiple Qty in cart

Hi,

 Actually This code for set custom price to each product in cart when it add to cart from Category Page,

That's why I found some solution for that add custom value to the Row Total of product

For that

A)  Open code\core\Mage\Sales\Model\Quote\Item\Abstract.php

     Find,  Function calcRowTotal()

  You can see this lines,  

    $total      = $this->getStore()->roundPrice($this->getCalculationPriceOriginal() * $qty;
    $baseTotal  = $this->getBaseCalculationPriceOriginal() * $qty;


    Simply, Add your custom value here

   $temp = 10;  /* Now $10 inserted in to the Row total of Product in cart */

    $total      = ($this->getStore()->roundPrice($this->getCalculationPriceOriginal()) * $qty) + $temp ;
    $baseTotal  = ($this->getBaseCalculationPriceOriginal() * $qty) + $temp;


Here the Basic idea for, Where to change for add custom value of row total of product
you can also set this dynamic as per your requirement,

Enjoy ::