I have a site with a navigation menu at the top using wp_nav_menu.
I need to be able to have sub-menu items that appear beside the main menu (not as dropdowns, but next to the menu instead of below it as the menu is vertical).
They do not need to be animated or anything.
When you hover on a parent page, the sub-menu should appear beside it and when you are ON the page belonging to the parent menu item, the sub-menu should be visible all the time.
Some CSS/Jquery work it looks like. Sub menu has two levels. I have a PDF showing what it should look like.