Phase Duplication Tool

Sometimes for a large building site, I'd like to separate the extent of Cut and Fill as a visual tool. 

To enable this, would be handy if we had a *duplicate* tool for phases so that we can review and highlight which shapes/features are to be noted as filled after the fact, particularly if controlled fill material was required to be imported (e.g. car park cuts where site fill was nominated to be Class B/C Rock on an existing  clay substrate.