Is it possible to have user defined column in Gantt chart like screenshot attached below?
There are 4 columns : Forecast Committed, Actual Committed, Forecast Cash, Actual Cash which needs to be present for all months and data needs to be displayed in grid view.
You can create as many columns as you want, however, it seems that you need to generate these columns depending on the date range.
Here is an example of how it can be implemented:
However, there is no built-in way to group columns over the years by using different rows. I think you should consider using the DHTMLX Suite component that has more functionality regarding the grid: