I wanted to assign a resource to different activities which follow different 3D paths. The manipulator function doesn't work while I try to reposition the resource at a different position for the subsequent activities.
1. Assign the Resources to the desired tasks
2. In Task Properties>Resources, for each task assign the 3D path to the resource and choose the desired alignment
3. To edit the object's location after it has been assigned to a task, right click in the 3D window and choose Edit>As Assigned> and choose the Task name to edit with the manipulator (The regular Edit> manipulators do not work after an object has been assigned, you must use Edit as Assigned)