Hi Joel,
You can read the SAP help fo these fields:
Planner Group for Customer Service and Plant Maintenance
Key that uniquely identifies the planner group
in Customer Service or Plant Maintenance.
Capacity planner group
Key referring to the capacity planner group, which is responsible for
planning this capacity.
Boths are keys that are used to identify responsibles. In different transaction you can filter by these keys.
For example, in case you have operations and you allocate capacity, you can use CM25 for Capacity Leveling and filter by Capacity Planner Group. This way you will identify all teh work center that are planned by your planner.
In the case of the planner group, there are other transactions. For example, with IH08 you can identify all the equipments that are responsible of your PM planner group.
Kind Regards,
Mariano