I have developed a Gantt chart with a dozen main goals. I have broken each goal into 6-15 subgoals, showing them on my chart as indents under the main goal. I would like to add a second level of sub- subgoals. I am not able to do this. The right click menu shows the indent action as shaded out and when I click on it nothing happens. The outdent, up, and down actions are all available.
What options do I have?