Yes, this is perfectly possible. The current Bill Approvers and the Organisation Administrators can easily match Bills to Purchase Orders in our mobile app.
Simply click on the MATCH button in the Bill:
Next, select the Purchase Orders for matching by ticking the checkbox next to each one and set the allocated amount:
Finally, click on DONE.
Approvers can edit a matching before the final approval is done:
After all approvals have been collected, only the Organisation Administrators can edit a matching: