Hi
Here you can defined different Planners like demand planner/supply planner / production planner.
As you might be aware in each industry we have certain peoples responsible for certain products. You can define these planners and assign these planners to respective product/location via T-code /SAPAPO/MAT1 - Product.
Once you assigned the planner id to product locations, you can differentiate your own portfolio in different transaction or functions in APO like alert monitor or selecting only respective products in Planning book.
Request you please cross check it from your side and let us know if you have any additional specific questions else request you to close the tread following How to close a discussion and why steps.
Thanks
Amol