Quantities for shop and category page

Hi there

I am trying to have quantities on my shop and category pages, I have managed to get it by calling the single page product add to cart button, but when I do that I either end up with two add to cart buttons, one which works with the quantities(the one from the single prodcut) and one which will only update a single add to cart regardless of quanitie. Which file might I want to be editing for thiis. I’ve tried add-to-cart.php.

Cheers for any help

Best

Harry