Don't show the stock only one category

-- url of the page with the problem -- : www.polaris-ranger-razor-atv.it/index.ph...t=listing&Itemid=384
-- HikaShop version -- : Hikashop Business 2.6.1
-- Joomla version -- : 3.5

Hi all,
Is it possible create two different situation?
i have 2 categories, category one and category two :
tha category one i want to show the stock but in the category two i don't want to show the stock

Thank you in advance
Marco

OK! Thank you very much, Nicolas.
I put these code:

//modifica  marco
$confronto = "Ricambi accessori";
if ( $this->element->category_name != $confronto) {
		if($this->row->product_quantity == 1 && JText::_('X_ITEM_IN_STOCK') != 'X_ITEM_IN_STOCK')
			$text = JText::sprintf('X_ITEM_IN_STOCK', $this->row->product_quantity);
		else
			$text = JText::sprintf('X_ITEMS_IN_STOCK', $this->row->product_quantity);
		
		
}
//fine modifica di marco

Hi Nicolas,
i put these code around the echo JText::_('NO_STOCK').'</br />';

//modifica  marco
$confro = "Ricambi accessori";

if ( $this->element->category_name != $confro) {
        echo JText::_('NO_STOCK_RICAMBI').'<br/>';
}//fine modifica Marco

Hi Nicolas, i understand my error.
I'm working on the template wrong... the file correct is quantity.php

thank you, your answer help me to understand where is my error