With YITH WooCommerce Catalog Mode, you can show or hide the price and/or the “Add to cart” button for products of your shop. If hidden, you can show a contact form through which users can contact you and ask for more information, like the “Ask info” button that is replacing the “Add to cart” button in the following screenshot:
To make the two plugins work together, you will only have to activate them both. The integration between these two plugins allows you to hide the price and the “Add to cart” button also from products with extra options.
For further details about YITH WooCommerce Catalog Mode settings, please refer to the official documentation.