This setting will allow someone else to approve/control when the approver/controller is out of the office.
Go to Admin Settings > under the USER MANAGEMENT click User > Select the name of the User > Details > click the Set out of Office.
A pop up screen will trigger. Fill in the following field, when done click SAVE.
Out of office approver - select the approver from the drop down list. This approver will approve expense on behalf of the approver who is out o f office.
Start Date and End Date