The best way to learn about a feature is to use it. We don't have any business services in our environment, thus we could use a similar approach as with the network map link indicator feature, where we created "fake" items and triggers to simulate network issues. We'll create items and triggers that will act as high-level service monitors.
We will invent two companies, called "Banana" and "Pineapple". Our company would be hosting various services for these two companies:
A code repository system for "Banana"
A warehouse analytics system for "Pineapple"
A ticketing system for "Banana" and "Pineapple"
Our service tree could look like this:
If everything is green at the top level, we know that all our customers are happy. If not, we see which customer is having an issue with a system, and we could see which system is affected. The ticketing system going down would affect both customers. And anything below these services—well, that's operational monitoring.