How to Make a Task a Subtask in Microsoft Project

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Making a task a subtask in Microsoft Project is quick—it’s all about indenting the task. Here’s exactly how to do it: 

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1. Open the 'Task' tab and make sure you are in 'Gantt Chart' view.
2. Click the tasks you want to turn into a subtask.
3. Click the tasks you want to turn into a subtask.
4. The task becomes a subtask, and the task directly above it becomes the summary task.