Create Gantt Chart that can be manipulated to add more steps.

I would like to create a gantt chart that shows multiple sub steps. Each would have a planned days & hours and then an actual days & hours. Those would be shown by highlighting the cells to the matched list above. More steps should be able to be added if need be, maybe by just clicking a button if possible. I have the expected outcome attached as an excel doc. Let me know if you need anything else to make this work.