Question categories
Rather than keeping all your questions in one big list,
   you can create categories to keep them in.
Categories can be created or deleted at will. But :
-  There must be at least one category in each context. So you
cannot delete the last category in a context.
- When you try to delete a category containing
   questions, then you will be asked to specify another
   category to move them to.
You can arrange your categories in a hierarchy so
   that they are easier to manage.
-   The up and down arrow keys change the order in
   which categories which are peers of each other are listed.
- You can also move a category
   to a new context with the up / down arrows.
- The left and right arrows are used to
   change the parent category of a category.
- A possibly quicker way to move categories is to click on the edit
   icon and then use the category select box to select a new parent
   category.
See also :