A. Create a new Approver record, with the Group ID field set to the ID of a Public Group that contains all of the managers. On the original manager's Approver record, click the Replace button and select the new Approver record.

B. On the original manager's Approver record, set the Delegated Approver lookup field to reference a different manager's Approver record, and set the Delegated End field for the date of the original manager's return.

C. Create an Approval Rule with an Effective Start Date and Effective End Date spanning the absence.
Populate the Approver field of the rule with the subtitle Approver, then add the rule to the existing Approval chain as the first step.

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