Some theme demos have a Services Post Type.
We have been asked to develop a website with 2 core service: Domestic and Commercial (for an electrical company).
Initially we were going to use a theme that has a Services post type, but I don’t see a way this would work with Dom and Com. So we will have to just do is as pages with Parent and Child.
Not sure even how it could be done, but if a Service could have multiple parents, and then children beneath it.