Bulk (or batch) appprove AP invoices - AME?

Oracle 11i, AME.B APINV
Our customer on Oracle 11.5.10.2 is looking to be able to mass approve AP invoices if they fall into a certain category. (certain suppliers, etc.) otherwise they will be approved through notifications, individually, just as now.
Current process
1 PO matched invoices - no approval required
2 non-PO invoices - Approval required based on AME groups (AME.B)

Planned change in process
2 non-PO invoices
  2a) if fall into certain category -- can be bulk approved by dedicated users
  2b) else -- individually approved as per AME rules (same as now)

Reasoning behind the requirement: large volume of invoices and approvers already have a report to review the transactions through. Then they put anything that shouldn't be approved (yet) on manual hold, before approving all other transactions assigned to them.