Are you talking about the approval rules or approval mappings? Reason I am asking this is criterias which you have mentioned are generally used for the approval mappings.
if its of approval mapping...I suggest you to take a look at the ITSM Admin Guide
Chapter:Configuring Approvals Page Numer 281.
All the categories which you mentioned is covered over there in detail.
As an overview all these categories Impacted Areas, Prod/Operational Categories, Change Manager/Coordinator Group can be used to pick up the right approvers for a Change Request which is matching these criterias.
If you are looking out to use Impacted Areas in your criteria when determining Approvers pls use IA Approval Process.
Change Level-IA Review Process
Change Level-IA Implementation Process.....you gotta select a Process which has IA when you are defining a process in the Approval Process Configuration for the Change Form.