A Sales Roster is a list of employees in the Sales Rep role. It's first name, last name, email address, employee id (maybe!) and their manager ("reports to").
Managers are also listed under their manager title with their "reports to".
It's not usually more than three levels deep, but there's nothing to prevent them from having a deeper hierarchy. I have seen four levels deep a few times.
I need to take a list of targets ("customers") based on some arbitrary criteria (rep requests/whatever) and combine them with the list. Other than mapping the lead to territory which allows the join to the sales roster, any number of related information may need to "tag along" as part of the payload.
This is usually part of an email blast that alerts reps their customers are requesting attention. Each rep that services that customer should be notified (many to many relationship between reps and customers).