Hi Haneef,
In the earthworks report they will be broken down by earthworks element name. If this is what you are after it might be better to give names to the earthworks elements, rather than tags on the outlines. We don't currently present elements by outline, because it's not clear how we should present volumes for internal outlines in particular. In Kubla Cubed these are cut-outs, so they don't really have a volume, but they affect the volume of the external outline.
To get the offsets I'd suggest you do a input data report export instead.
You are correct that the volumes within a phase are for that phase only.
Leo