To automatically order topics alphabetically:
Right-click the parent topic and select Sort Child Topics Alphabetically.
To manually move topics within the topic hierarchy:
On the Search Workbench tab, select Topic Sets from the Show menu.
In the Topic Sets menu, select Topic Sets > Your Topic Set.
Right-click the topic and select from the menu to copy or cut it.
Right-click the topic under which you want to paste the moved topic. You cannot paste a subtopic back into the topic from which it was cut or copied.