The payroll groups are where you can select the group of people you have grouped together for pay runs. Typically, a payroll group organizes employees based on employee type, pay frequency, location, and so on.
The Employee window is where you can see your employees. The main employee window will have basic employee information such as their Name, their employee number, their status, their department and their pay group.
The Personnel Information window will allow for the viewing and updating of all personnel information. This can only for done once the employees have been added in the Employee screen.