Orsdxy

I need to create a new product which my customer need not to pay shipping amount for this (ex: free shipping), but, it doesn't work, here is the snapshot for your reference.

If you want per product basis shipment then you can go with below
approach

There are ready extension available in market you can use directly.

Free :
https://github.com/micronax/magento-attributeshipping

Paid :
https://marketplace.magento.com/kaushik-distance-based-shipping-charge.html

If you want to make your own then create basic shipping extension and with in that you can write down your collectRates as per your logic, you can take reference of below code for that

class Fgits_Shipping_Model_Carrier_Customrate extends Mage_Shipping_Model_Carrier_Abstract implements Mage_Shipping_Model_Carrier_Interface

{

    protected $_code = 'fgits_customrate';

    protected $_isFixed = true;

    public function collectRates(Mage_Shipping_Model_Rate_Request $request)

    {

    if (!$this->getConfigFlag('active')) {

        return false;

    }

    if (!$destCountry = strtolower($request->getDestCountryId())) {

        return false;

    }

    $result = Mage::getModel('shipping/rate_result');

    // Some meta-information

    $method = Mage::getModel('shipping/rate_result_method');

    $method->setCarrier('fgits_customrate');

    $method->setCarrierTitle($this->getConfigData('title'));

    $method->setMethod('fgits_customrate');

    $method->setMethodTitle($this->getConfigData('name'));

    // Check if cart total exceeds setting value

    $maxCartValue = floatval($this->getConfigData('maxCartValue'));

    if ($maxCartValue > 0 && $this->getCartTotal() >= $maxCartValue) {

        return false;

    }

    // Calculate shipping cost

    if (!$orderShippingCost = $this->determineShippgingCost($destCountry)) {

        return false;

    }

    // Set shipping cost

    $method->setPrice($orderShippingCost);

    $method->setCost($orderShippingCost);

    $result->append($method);

    return $result;

    }

    public function getAllowedMethods()

    {

    return array('fgits_customrate' => $this->getConfigData('name'));

    }

    public function determineShippgingCost($countryCode)

    {

    $cart = $this->getCart();

    $cart_items = $cart->getAllItems();

    $_helper = Mage::helper('catalog/output');

    $fn_name = 'getShippingCost'.ucfirst($countryCode);

    $cartShippingCost = 0.0;

    foreach($cart_items as $items) {

        $cur_fproduct = Mage::getModel('catalog/product')->load($items->getProduct_id());

        if ($shippingCost = $_helper->productAttribute($cur_fproduct, $cur_fproduct->$fn_name(), 'shipping_cost'.$countryCode)) {

            if ($cartShippingCost < $shippingCost) {

                $cartShippingCost = $shippingCost;

            }

        } else return false;

    }

    return (float) $cartShippingCost;

    }

    private function getCartTotal() {

    $quote = $this->getCart();

    $items = $quote->getAllItems();

    foreach ($items as $item) {

        $priceInclVat += $item->getRowTotalInclTax();

    }

    return $priceInclVat;

    return Mage::helper('checkout')->formatPrice($priceInclVat);

    }

    private function getCart() {

    Mage::getSingleton('core/session', array('name'=>'frontend'));

    $session = Mage::getSingleton('checkout/session');

    return $session->getQuote();

    }

}