MSS: approve travel expenses of managers

Hello Experts,

could you please give me advices for standard-process within MSS (on NWBC for html; using POWL - no WF) for managers who shall be allowed to approve their own travel expenses. I was thinking of following opportunities:

1. Save travel expense in approved status -> nothing to do more for approval

2. Save travel expense in unapproved status -> daily report sets those in approved status

3. Approve their own travel expenses in MSS

Or do you know other/more practical opportunities?

Please also give me tips on how to set up the process.

Thanks a lot!

Best regards

Raphael