Can I sort employees into employee groups or departments?

On DeskTime, you can group employees into Employee groups, for instance- "Marketing", "Sales", "Management" etc.

To create an Employee group, go to Settings-> Groups, and click on the "Add new group" button. To assign an employee to a particular employee group, go to Settings-> Employees-> Edit-> Group

For each employee group, you can then define which applications are productive, unproductive or neutral. For example, Facebook and Twitter could be a productive application for social media managers while it would be unproductive for others. See more information on how to change productivity settings here.

See video illustration below.