Yes, everything in our methodology and software application works with selling services. In fact, we use a consultative selling approach that focuses on benefits, pain points, and asking good questions. With that, our system in some cases works better with services than products, but definitely works for both.
But your question is valid because in our training and software, there are many places where we say "your product" when talking about what you sell. But if you use our system and sell a service, just insert your service everywhere you see us mention "product".