Hello,
Do you want to create accordion or simple drop-down with multi-levels?
If you want simple drop-down with multi-levels then you need to create subitems for the subitems
http://prntscr.com/j6tbz4 to get http://prntscr.com/j6tccj
and add the following CSS
nav .simple-list .submenu .submenu {
left: 100%;
margin-left: 0;
top: 0;
}
If you want to create accordion to open it by click you need other CSS styles + also JS customization because there is no such feature in this template. Contact WPKraken team to get help with additional customization.
Regards