Outline: A hierarchical structure for a project that shows how some tasks fit within broader groupings. You can show or hide the subtasks of a summary task. For example, you may want to hide your subtasks to display only top-level tasks, and then print that view to create a summary report of your project.
View menu, click
Task Name field, select the summary task containing the subtasks you want to show or hide.
 to show the subtasks or click
 to hide the subtasks.
Show all subtasks, click
, and then click
All Subtasks .
You can also show and hide subtasks by clicking the summary task's outline symbol. Outline symbols indicate whether a summary task has subtasks displayed
or does not have subtasks displayed
An outline symbol presenting a plus sign indicates a summary task with its subtasks hidden.
An outline symbol presenting a minus sign indicates a summary task with its subtasks showing.
Hide and show all subtasks up to a specific outline level
To show only part of the outline, click Outline, and then click the outline level number up to which you want to view.
This option is available only in Project Viewer for Win PC/Server, Project Viewer for Win Web/Server, Project Viewer Online Subscription, Project Viewer for SharePoint Server, Project Viewer for SharePoint Online, Project Plan 365 for Win PC/Server, Project Plan 365 for Win Web/Server, Project Plan 365 Online Subscription, Project Plan 365 for SharePoint Server and Project Plan 365 for SharePoint Online products