Hello
I have never implemented it, but the SAP Help provides a lot of information about that:
Plant Manager 2.0 - Business Package for Plant Manager - SAP Library
As far as I can see, the Plant Manager 2.0 basically consists on Remote BW iViews. For example:
Average Stock Value: You can use this iView to display the average stock value in your plant from the SAP Business Information Warehouse.
So if you are trying to implement that, I suggest you to discuss with your BW consultant.
BR
Caetano