Ideas can be moved by drag and drop. To move an idea (and its children), click on its icon, and drag selection into target idea : currently moving idea becomes a child idea or target idea.

Note : moving an idea is not directly available between different documents. A copy is done instead. Use Cut/Paste to emulate idea moving (Ctrl+X/Ctrl+V).

You can also drop the idea in the "Associations" tab of an opened property dialog of another idea : in this case, WIT creates an association of the target idea to the source idea (the one which was just dropped).