The following steps are used to add custom field offer in Opencart admin side(in add product section) Free Download http://www.opencart.com/index.php?route=extension/extension/download&extension_download_id=160521 Add a field named “Offer” to the product table in your MySql. SQL CODE: ALTER TABLE `product` ADD `offer` VARCHAR( 255 ) NOT NULL AFTER `model` ; Usage; <?php echo $text_offer; ?></span> <?php echo $offer;…