Create a Partial Selection

Click on the Person Icon to the left hand side of the department

The following screen will appear

Because the department was highlighted, it means all employees are included. To exclude some employees, simply select their name from the list and click the Exclude button in the center of the screen. Alternatively if you only wanted to include a couple of employees, you could Exclude All to start and then just select the names you want to include and select the Include button

Click OK once finished and you will see the Person Icon to the left of the department will now be partially shaded. This indicates there is a partial selection of employees within the department