Joomla: Automatically add articles in a category/section as submenus

[JenniferT]

I have a section in Joomla called About.Under the About section I have categories One, Two and Three.In my Main Menu I have about as a link which shows a component showing all the categories and articles.I want to have all the categories made as submenus of the section and then further all the articles as submenus of their categories.It is obviously possible to do this manually. However, I would like new articles to automatically be added to the menu. (Mainly because I want to allow a user to add articles from the front-end.) Is there any way to do this, either with the built in Joomla functionality or with a plugin, module or component?