Is there a way to have a main menu item that automatically populates drop-down sub-items based on portfolio items and categories? For example: if I had a "Dogs" portfolio category with "Snoopy" and "Rover" portfolio items under that category, it would be nice to have a "Dogs" item in my main menu that auto-populates portfolio items within that category. This way I don't have to manually add a portfolio item to the dropdown every time I create a new one.