How Do I Set up My Backup Approver? [FAQ]
From Menu > Name > My Settings, you are able to select the person you want to designate as your backup for timesheets and expense reports that get sent to you for approval.
This setting can also be updated via the Employee Record: Accounting setup section.
NOTE: This can cause a loop in the approval process if you are the backup approver for the user that is your main approver.