Enabling approvers to assign a delegate or alternative to approve PeopleSoft requistion when OOTO

We are on PS Financials 9.2.  We want to enable our approvers to be able to setup a delegate or alternative when they are out of the office so that we don't delay our requisition workflow process.  We do not currently have PeopleSoft HR but rather load the employee information from our payroll system into PeopleSoft Financials nightly.  Is this function available or does it need to be own by the workflow administrator?