Duplicate content URLs from bespoke ecommerce CMS - what's the best solution here?

[McTaggart]

Hi Mozzers Just noticed this pattern on a retail website...

This URL product.php?cat=5

is also churning out

products.php?cat=5&sub_cat= (same content as product.php?cat=5 but from this different URL - this is a blank subcat - there are also unique subcat pages with unique content - but this one is blank)

How should I deal with that?

and then I'm seeing:

product-detail.php?a_id=NT001RKS0000000 and

product-detail.php?a_id=NT001RKS0000000&cont_ref=giftselector (same content as product-detail.php?a_id=NT001RKS0000000 but from this different URL)

How should I deal with that?

This is a bespoke ecommerce CMS (unfortunately).

Any pointers would be great Best wishes, Luke

 

[TimHolmes]

I would imagine that the best solution would be to point the sub cat canonically to the parent this making the parent category page the dominant authority page.