YITH WooCommerce Product Add-Ons allows you to configure additional options that can be added to products in your shop. For each action, it’s possible to choose a name, an image and a price, which will add up to the basic ones the product has.
The integration between the two plugins will allow your users to purchase a subscription for several services, meaning, for instance, a “subscription” product with a custom set of selected add-ons.
You will only have to activate both plugins, in order to make them work together. After that you can create your subscription product as usual, and add your add-ons. You can either add the Add-ons from the product editing page (example above). Or you can add them via the Add-ons menu, like explained in the YITH WooCommerce Product Add-ons documentation here.
The recurring price of the subscription will be the regular price + add-on price.