Purchase Order - Approvals

Is there a way that employees can request purchase orders but they need to be approved by a line manager before they can be emailed out?

At the moment any employee can just send a PO out without a second stage approval?

We should also be able to see who has requested the Purchase Order so when the invoice comes in we know who to check this with, and we should also be able to see who has approved it. This shouldn't be via an audit log but by a standard filter view

This is a basic function of Purchase Order software