When a named group is attached to a task, it is automatically converted to an actor, which can then be used for animation purposes. During the conversion, the coordinate system is added to the named group at the centroid of the named group. In the View Attributes dialog (Settings > View Attributes), turn off Constructions when adding/removing elements to existing named groups and when attaching elements to a task. Otherwise, a named group can be accidently added to another, producing undesirable results. For better performance and maintenance, to add a number of elements to a single task, create a named group for the selected elements and then attach the named group to a task.