Create ontology using rules in protege

Question

I have a three classes:

• Department: individuals "Corporate_Services" and "Finance"
• Cause: individual "vehicle_driving"
• Injury_type: individuals "minor" and "major".

I have 2 object properties:

• "has_cause": domain "Department" and range "Cause"
• "has_injury_type": domain "Cause" and range "Injury_type".

I have to create an ontology using the following rules:

1. Corporate_Services -> has_cause -> vehicle_driving -> has_injury_type -> minor.
2. Finance -> has_cause -> vehicle_driving -> has_injury_type -> major.

How to do it? I cannot use property chains because I actually have more than 3 classes.