Hi,
The view is "product | show_default".
The block which add the button is the "quantity" block. You can duplicate the code (and changing the "id" in order to remove the HTML errors).
Something like:
<div id="hikashop_product_quantity_main_2" class="hikashop_product_quantity_main">
<?php
$this->row = & $this->element;
$this->ajax = 'if(hikashopCheckChangeForm(\'item\',\'hikashop_product_form\')){ return hikashopModifyQuantity(\'' . $this->row->product_id . '\',field,1' . $form . ',\'cart\'); } else { return false; }';
$this->setLayout('quantity');
echo $this->loadTemplate();
?>
</div>
Regards,