Changes Options Based on Input?

I am working on creating a webform (employee change form) that our admins can complete and send for signature. I would like to make one form that all departments can use.

For instance, I would like the employee to able able to choose the department (drop-down menu) and the options for pay grade and position change based on the department chosen. Is this possible? 

For example:

Employee options the form and chooses the "department". From the drop-down list, they see the options (Police, Sanitation, Parks). They choose Police. The choice they made would give them a new dropdown with only titles relevant to that department in the  "title" section. Once the department title selection is made, it would auto-fill the grade/pay. 

*Note* Each position in our city has a grade that has an hourly rate attached to it.