Hi sorrentinotrade, Really sorry for the delay in the reply. Yes you can create a new extrafield in the K2 backend then add this code :
<?php echo $custom[9]->value;?>
anywhere on these files : [roo]/templates/deals_plazza/html/com_k2/dealplazza/category_item.php
[roo]/templates/deals_plazza/html/com_k2/dealplazza/item.php
to display it.