Sub-Menu

Hello,
I know how to create a sub-menu, but I want to know how to create a sub-menu of a sub-menu. When I bring the page more to the right it doesn’t show up on the list when I hover over the sub-menu of my main category. For an example I would have on the main menu “Sports” then for the sub-menu I would have “Basketball” then as a sub-category to that I would want to put “Women’s basketball”. Thank you for your help.