If you have the Absences Administrators role, you will see a link to manage Holiday Plans via the control panel under the configuration menu.
If you select this link you will be taken to the 'Manage Holiday Plans' page where you can quickly create, edit, adjust and delete plans for groups of people and/or individual users.
Simply click the button ‘Select users or groups’ which will allow you to pick the user or group for which you wish to create a plan.
To give the user or group a plan, select the grey (+) for the year in which you want to create it.