Configurable Purchase Variables for Magento 2 facilitates customers to purchase a number of products with variable options. For example, when you intend to to buy a T-Shirt on a default Magento store, you are not able to buy a number of products with the same style or size but with different colors in one purchase. Instead you can only add each of item to cart one by one.
This extension will enable you to do this by only 1 click add to cart. You just only need to choose the size before inserting the quantity for each of the color you want and then, add to cart!
Etension features list
Easily enable or disable extension in backend area.
Easily enable or disable features for each separated configurable products.
Allows to show quantity box or both quantity input and swatch options.
Allows to show the remainder quantity of each configurable product.
Get details: https://www.magesolution.com/configurable-product-purchase-variables.html