To insert a subtask in Microsoft Project, you’re really doing two things: adding a task and then indenting it under a summary task. Here’s the clean, step-by-step way:
- Go to the 'Gantt Chart' view and click the row below the summary task to enter tasks.
- Select the new inserted tasks.
- Go to the 'Task' tab.
- Click the 'Indent Task' button to insert a subtask in Microsoft Project.
- The task is now a subtask under the summary task.



