Did you know that there is an easy way to always roll up Gantt bars to a summary task? On the Format tab, click Layout, and ...

{Did you know that there is an easy way to always roll up Gantt bars to a summary task? On the Format tab, click Layout, and then select the Always Roll Up Gantt Bars check box.

To roll up individual Gantt bars to a summary task, select the Rollup Gantt Bar To Summary check box in the Task Information dialog box.}