The first thing to do is to think about complementary services to their products. It depends on the product you are selling; it could be consumables as a service. Software as a service is a good example too and probably the easiest that you get on top of your product line. More companies are bundling together different offering types to become holistic solution providers. It is not just about selling hardware, services, or even subscription-based services; the key here is being able to create a customized package that best suits your client.