floor manager

I am unclear on what the floor manager is supposed to do

I am told with Revit when MEP services are modelled they can be automatically annotated and dimensioned

Does the floor manager enable automatic labelling of duct/pipe levels and dimensions off grids?

If that is its purpose is there a guide or example avaliable

i have been working on a number of large projects using the Bentley mechanical software and they were all manually dimensioned and had  manually edited level cells