By consolidating related projects into a master project, project managers can organize and manage complex projects or multiple related projects more effectively. Commonly, master projects consist only of inserted subprojects, but in some cases, the master project can have own tasks as well.
When opening a master project file in application, all of its inserted subprojects are loaded as well. If, for some reason, application fails to load some of the subprojects, e.g. the file has been moved to a different location or you do not have permission to open it, a warning message appears and only the project summary task for the subproject is shown in the views.
Inserted projects are indicated in the Indicators icon with a specific icon. Pointing at the icon with your mouse, a tooltip with the location of the subproject file appears. You can also view the location of the subproject file if you insert the Subproject File column in the table portion of the view.
Tasks from different subprojects can be linked together, forming a predecessor/successor dependency. When you open one of the subprojects in application, all of the predecessor tasks from other subprojects will be shown next to the local tasks in the project being opened. They appear with different bar/box style and font in the different task views, e.g. in grey color, so they can be visually distinguished from the local tasks. These tasks are called External tasks.
By having the external tasks shown in the views, application is able to draw the links between them and the local task, providing a more realistic view over the whole set of tasks and their dependencies. In addition, the predecessor or successor field for the local tasks linked to some external task shows the path to the project file in which the external task is defined and the ID of that task in that project.
The application allows you to open Microsoft® Project files (mpp) that contain subprojects. If the opened project plan includes subprojects, a specific graphical indicator will be shown in the Indicators column. This indicatorwill tell that the task next to it is an
inserted project (also called a subproject). The inserted project appears as a
summary task in the master project. To upload subprojects, click on the plus
sign (+) corresponding to each subproject and you will be asked to locate the
subproject on your disk. Then the subproject will be instantly viewed.