Workflowy has nice organization of information but it lacks the feature of moving branches to other levels in the hierarchy. This feature is possible in Gqueues but lacks the nice features of Workflowy of structuring information.
EDIT: Finally, I have found out that
Workflowy provides this feature via
tags. So, this is the answer and this question could be deleted, but maybe it's
still useful. If it should be deleted, downvote it.