Here is a simple way of adding product link such as Related, Upsell and Crosssell Link to a product in Magento. I just got the way of doing this and thought to share! So kind of me :) [source language=”php”] /** First Create Link Array of following type **/ $linkArray=array(‘product_id’=>array(‘position’=>’’)); /** Then set the Link Data **/ /** For Upsell Link**/ $product->setUpSellLinkData($linkArray); /** For Crosssell Link**/ $product->setCrossSellLinkData($linkArray); /** For Crosssell Link**/ $product->setRelatedLinkData($linkArray); $product->save(); [/source] Hope this helps.