Details on the project-subproject relationship
The project-to-subproject relationship has the following characteristics.
Any project or request can be linked to another project with the same security policy.
A project can have at most one parent project or program, but not both.
A project can have an unlimited number of child projects.
A project can have both a parent and children; this option makes it possible to have an n-level deep hierarchy for projects (parent-child-grandchild etc.).
However, requests can be children to projects only. A request cannot be a parent.
You cannot delete a project that is linked to either a parent or child; you must first remove all parent-child (and project-program) relationships before you can delete a project.
When copying a project that is either linked as child or parent, the new project is not linked.
Metrics, budgets, and workflow do not roll up from a child project to a parent project.
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