YITH WooCommerce Product Add-Ons allows you to configure additional options that can be added to products in your shop. For each option, it is possible to choose a name, an image and a price, which will add up to the basic ones the product has.
To make the two plugins work together, you will only have to activate both plugins. The integration between these two plugins allows you to hide the price and ‘Add to cart’ button also on products with add-ons.
For further details about YITH WooCommerce Product Add-ons settings, please refer to the official documentation.