Admins and managers can apply for leaves on behalf of their employees.
In the event where the manager is unable to approve an employees leave request, the admin will be able to do so.
Applying Leaves on behalf of employees
Go to Team Leave > Leave Balance > My Team Balance if you are a manager OR All Balance if you are an admin.
Click on the employee that you are applying for leave for.
Click on Apply Leave or Compensatory Leave Request and fill in the required details. (see: How to apply for leave)