First, select the product you want to add to the combination purchase on the JD.com website, then find and click the "Combination Purchase" button on the product details page.

Next, select the quantity corresponding to the product on the combination purchase page and click the "Add to Cart" button. If you need to add other products, you can continue to select and add them to the shopping cart on the combination purchase page, and finally settle the bill on the shopping cart page.