If a manager is taking a leave of absence, how can the admin using Advanced...

On the original manager's Approver record, reference a different manager's Approver record inthe Next Approver lookup field. Clear the Next Approver lookup field once the original managerreturns from leave.

Create an Approval Rule with an Effective Start Date and Effective End Date spanning theabsence. Populate the Approver field of the rule with the substitute Approver, then add the rule tothe existing Approval Chain as the first step.

On the original manager's Approver record, set the Delegated Approver lookup field toreference a different manager's Approver record, and set the Delegation End field for the date ofthe original manager's return.

Create a new Approver record, with the Group ID field set to the ID of a Public Group thatcontains all of the managers. On the original manager's Approver record, click the Replace buttonand select the new Approver record.