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Indent and outdent tasks to show hierarchy — that is, to make your task list an outline. An indented task becomes a subtask (subtask: A task that is part of a summary task. The subtask information is consolidated into the summary task. You can designate subtasks by using the Project outlining feature.) of the task above it, which becomes a summary task (summary task: A summary task has more than one subtask below it. Subtasks are indented below the summary task in the project frame. The summary task bar has special markers (inverted yellow triangles) to indicate that it has subtasks.). A summary task is made up of subtasks, and it shows their combined information.
Note Summary tasks don’t always add up. Some summary task values (cost (cost: The total scheduled cost for a task, resource, or assignment, or for an entire project. This is sometimes referred to as the current cost. In Project, baseline costs are usually referred to as "budget.") and work (work: For tasks, the total labor required to complete a task. For assignments, the amount of work to which a resource is assigned. For resources, the total amount of work to which a resource is assigned for all tasks. Work is different from task duration.)) are the total of the subtask values, others (duration (duration: The total span of active working time that is required to complete a task. This is generally the amount of working time from the start to finish of a task, as defined by the project and resource calendar.) and baseline (baseline plan: The original project plans [up to 11 per project] used to track progress on a project. The baseline plan is a snapshot of your schedule at the time that you save the baseline and includes information about tasks, resources, and assignments.)) aren’t.