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

{Did you know that there is an easy way to always roll up Gantt bars to a summary task? On the Format menu, 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.}
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