Add to cart switches to quantity button

Hi Fam,
I am looking to build a functionality like this https://livingliquidz.com/products/New%20Arrival/New%20Arrival/1708 where once the user clicks on Add to Cart the product is auto added to the cart & a quantity button comes up. Clicking on the quantity button adds more units to the cart.

Can someone help me with this please?

 

This site will teach you how to build a WordPress website for beginners. We will cover everything from installing WordPress to adding pages, posts, and images to your site. You will learn how to customize your site with themes and plugins, as well as how to market your site online.

Buy WordPress Transfer