Leave policies are employee level.
Once the leave types & policies are created, you can assign a policy to employees in the following 3 ways
While creating a new employee you can assign a leave policy
Or
Goto View Employees available in Employees tab under HR Management Menu
Select the employee to be assigned & click the three-dot edit button to assign or change the leave policy
Or
Goto company settings under administration & select leave policies & holidays tab
Click on the Leave Policy & then the policy name
Check for the policy rules
Click the continue button to assign a leave policy to the employees you want to or select all
Hope your query is answered !!!