Can I get rid of group bar in a Gantt chart type + excel example ?

xViz Community Can I get rid of group bar in a Gantt chart type + excel example ?

1st question:

Is there a way to get rid of the group bar in the timeline view other than by selecting "GanttResource" type?

2nd question:

Is there an excel example that shows how to have multiple milestones AND grouping of tasks with hierarchy on the left data grid?

Thanks in advance!