As a cost object owner, you can delegate approval permissions to a colleague in Spend > Approvals > Cost object approvals. Choose the corresponding company and cost object if you are an approver for multiple companies and/or cost objects. 

Select the employee you want to appoint as delegate and an optional expiry date. If you set an expiry date, approval permissions automatically revert to the cost object owner after this date. Confirm your changes by clicking Save.

Your delegate can see the delegated expense reports in Spend > My tasks, Approvals tab or in Spend > Approvals > Approvals list.

If you display the Current approvers column, you can see both the cost object owner and the delegate as approvers. In the History section at the bottom of each expense report, the delegate who approved the expense is displayed as ”Approved on behalf of line manager User B“.