BIA scope

Answer: The most suitable people to answer what activities should be considered related or unrelated to your main services are the processes owners and the key users (people that have the best knowledge of the process).

In your example, you should ask the person who handles salaries which activities he relies on to deliver his results (e.g., salaries payment), or what would be the worst thing that could happen that would prevent the salaries to be paid. From the answers of these two questions you can identify activities you should consider related to your main process.

Regarding more examples, in the video tutorials that came with your toolkit, you will see how to make considerations for what is related or not to your main process while filling out all the data regarding BIA.