Yes, you can apply as many leave policies to your employees as you want.
All you need to do is define the rules of each of your policies, e.g. Earned Leave, Casual Leave, Sick Leave etc and then assign it to your employees all at once.
Same functionality applies for leaves like Maternity/Paternity and Sabbatical leaves.
You’ll see a system provided leave type for Maternity and Paternity Leave. For Sabbatical you’ll to create a new leave type and assign to the employees.