One way to sell a subscription is to add it directly to a quote as an item. Another way to sell a subscription is to associate it with a product and add the product to the quote. This way, the subscription is like an accessory to the product.
You can associate multiple subscriptions with a product. To associate a subscription with a product:
1/ Go to "Catalog > My Products" in the left navigation menu.
2/ Click the 3-dot menu of the product and click "Edit."
3/ Go to the "Subscriptions" tab in the product details view.
4/ In the Search bar, type the name of the subscription. The subscription will be listed in the search results.
5/ Click "Add" next to the subscription to associate it with the product.