If you are an Approver or a Controller, you can assign a temporary approver or a controller to approve or control the expenses while you're out of the office.
Here are the steps to add a temporary out-of-the-office approver/controller,
1. Go to Profile > Personal Settings.
2. Select the Account Delegation page. From here, you can select the user to whom you want to delegate your approval / controlling responsibilities while you are away and enter the duration using 'Date from' and 'Date until'.
3. Click Add, to save the changes.
4. Once the new approver or a controller was added. The result will appear in the 'Your Out of Office Approvers' section.
Note: The appointed approver or a controller will receive an email notification that he/she was assigned as a temporary approver or a controller.