solevd. found solution on forum.
{$product.link|escape:'htmlall':'UTF-8'} Replace with {$product.reference|escape:'htmlall':'UTF-8'}
in product-list.tpl
in this case reference field becomes where you insert url
also you will need to make some changes to classes/product.tpl Database as you will get 32 character limit, so follow PASCALS post to do this in this thread