How do I use them? I've watched the video and saw that you drag and drop a feature onto another feature. I tried drag and drop in the OnTime client and I am unable to drag features to a another feature to add them as a subitem. I only get the visual feedback of the slashed-circle icon for everywhere I drag except for the project / release trees.
Is there somewhere I have to go in order to enable subitems? Is it another feature that is not implemented in the windows client?