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Magento How do I enable free shipping in backend only (for order entry)

1> Override or your custom shipping method file 

      app/code/core/Mage/Shipping/Model/Carrier/Freeshipping.php

       or 
     app/code/local/YourCompany/NewModule/Model/Carrier/ShippingMethod.php

 2> You can find 

    public function collectRates(Mage_Shipping_Model_Rate_Request $request)

   And add below two code in function 

         if (!Mage::app()->getStore()->isAdmin())) {
            return false;
        }

      after below these two lines

         if (!$this->getConfigFlag('active')) {
            return false;
        }

And set to active in backend
You can place the code in local if you dont want to overwrite the core
This should work

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