If a folder, file, or change request in a child view has the appropriate settings, you are able to branch it. Meaning, you can separate it from the corresponding item in the parent view.
At any time, you can determine whether a folder, file, or change request in a branch view is set to Branch On Change (that is, its current branching behavior), and if theBranch On Change field is enabled, you can change it's branching behavior.