After adding in your Staff details, you can group them into their respective departments for easier selection, and application of rules if necessary.
From the Staff App, go to the Department tab, and click [Create Department]
Enter the Department Code and Name, then click [Add Staff] to select members
Tick the names of the staff you wish to add to the particular department, and click [Add]
Whenever you want make changes to the any department, just go back to the Department page, choose the department you wish to add/remove a staff from, and click Edit (pencil icon).
Do note that a staff can only be added to one Department at a time. If you can't find a staff, it is most likely they have already been added to another department.