Documents can be removed at any time. If a document contains other documents, they will be removed along with it.
To remove a document, select it and use Project Manager > Home > Remove.
Removed documents are perserved, and when a document contains other documents the hierarchy of these removed documents is also maintained. Previously removed documents can be restored at any time via the removed documents tree.
Removing an item requires the Project Manager to immediately save any additional changes done before the removal.