All the tasks of a story moved to a different story when it had a child added
Release : 2018
When you create child stories underneath an existing story, you are telling the CA Agile Central tool that the scope of work is too large to fit into a single iteration. Because the work is now being done in the child stories the tasks that represent that work are moved to the child stories.
If a User Story has tasks assigned to it, those tasks will automatically be moved to the new child story.