Open subcategories in submenu on click in primary menu

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You can do this one of three ways:

  1. The first been you would need to make the menu static within the theme itself so you have full control over all the anchor links and classes
  2. In the menu manager you could assign a custom class to the anchor link and then bind jQuery events to the anchor links so they correspond to a specific menu of your choice
  3. Create a plugin that allows you to set an option that allows specific menus to become children of the parent as a separate menu still but only accessible by hovering over a menu item that has been assigned a submenu

Hope that helps a bit more.