Yes. If the employee is unable to submit the leave requests themselves, the admin is able to submit a leave request on behalf of the employees. 

The leave submitted will still go through the usual routing to the respective manager(s). Both managers and employees are able to see that the leave has been submitted on behalf by the admin in charge.

To apply for leaves on behalf, go to Leaves > Requests > Click "Apply on behalf"

Fill in all relevant fields and click submit.

Once successfully submitted, the leave will appear in the leave requests page.