It's important to get your company structure in place before you start adding users to your account, so that you can assign them to their teams at the same time that you set up their profile. Adding a user to a team will automatically place them in the relevant department as well, so you will only ever update details on the team level. Don't worry if you've already added your users though - you can always go to an employee's profile to update their team, or do a bulk update to assign everyone to a team.
Visit our Help Center for step by step instructions to create and update your teams and departments.
Customer Success Manager