When you customize a consolidation, you can insert individual projects in a specific order and into any outline level in the consolidated project file. You can even insert a consolidated project into another consolidated project.
To customize a project file consolidation
.
By default, an inserted project file is linked to its source file; if you change one file, the change automatically appears in the other file. This option is useful when you frequently update either the inserted project or its source file and you want both of them to remain exactly the same. Sometimes, however, you might want an inserted project to be independent of its source file, and vice versa. In that case, you can break the link between the two files, so that changing one doesn’t automatically update the other. The tasks from the inserted project will then belong to the consolidated file.
To delete the link between an inserted project and its source project
file