You can view the project timeline by clicking on View Tab and then checking the Timeline check box. You can add a task to the timeline by right clicking on the task and selecting the Add To Timeline option.
You can choose to use a single project plan with multiple projects or you can use a Master Project Plan.
To see how we can use this feature from MS Project we will use a Project Plan with 4 sub projects - Alpha, Project Beta, Gamma and Whiskey. MS Project has the Timeline view which with small minor customization can be used to generate an amazing project view which can allow anyone to understand what all projects and related tasks are in progress.
