Object's faces management
Better management of the diffectent faces of an object and have the same options of the propertu tab as those of the object (material,color, opacity,...)
Could you tell us more about what you would like to manage with object faces?
With respect to properties, color, opacity, etc are properties that are related to the material that is applied to the object. So you can access them by double clicking on the face whose material you want to edit.
Did you want something more specific? Let us know!