We sacrifice by not doing any other technology, so that you get the best of Magento.

We sacrifice by not doing any other technology, so that you get the best of Magento.

First of all, you have to create a new module. After that, you have to put the code in config.xml

 <adminhtml>
        <events>    
            <adminhtml_block_salesrule_actions_prepareform>
                <observers>
                    <magemonkeys_custofield>
                        <type>model</type>
                        <class>Magemonkeys_Custofield_Model_Observer</class>
                        <method>adminhtmlBlockSalesruleActionsPrepareform</method>
                    </magemonkeys_custofield>
                </observers>
            </adminhtml_block_salesrule_actions_prepareform>
        </events>
 </adminhtml>

in Model/Observer.php file you have to put this method and code.

<?php
class Magemonkeys_Custofield_Model_Observer
{
    public function adminhtmlBlockSalesruleActionsPrepareform($observer)
    {

        $fieldset = $observer->getForm()->getElement('action_fieldset');
        $fieldset->addField('sku', 'text', array(
            'name' => 'sku',
            'label' => Mage::helper('freeproduct')->__('Add skus'),
            'title' => Mage::helper('freeproduct')->__('Add skus'),
            'note' => Mage::helper('freeproduct')->__('Add sku(s) separated with comma'),
        ));
    }
}
?>

And after that, you have to flush the cache and check.

field_5bfb909c5ccae

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