Multi-Level Approval in NAV 2015

Hi All, in NAV 2015, is it possible to do multi-level approval as below (by either application setup or technical modification):

User create PO or SO -> Level 1 Approvers, then -> Level 2 Approvers, then -> Level 3 Approvers -> release of PO or SO

Each level allow more than 1 approvers , but anyone approver's approve of this level can make the PO / SO to next level or next step.

Anyone approver's reject of any level can make the PO / SO rejected.

This level approver(s) only see the SO / PO after previous level of approver(s) (if any) have approved the doc.

Finally all SO / PO must be approved by three level of approvers before release.

Any idea? Both application setup and/or technical mod. solutions are welcome, many thank in advance

(Just a remind: NAV 2015 without workflow as NAV 2016 or later, so suggestion of using workflow may not work)

Frankie Cheung