Thank you for contacting us today.
This is called a sub menu, you can do this by going to Admin Panel > Menu > Edit Menu, http://prntscr.com/a7mcup
Please look at the screenshot, as you can see, the arrows will make your menu's be moved to a child node of that certain menu.
In this case, I have already edited and updated your menu's so that Under the Events Menu, there will be a Sub Menu "Tournaments" then the child node of Tournaments will be "Match Reports". http://prntscr.com/a7mdaf
I hope I have solved your problem in here.