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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

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