Clickable Submenu on Mobile Screens

Hi,
I am building a WP theme and using default sub-menu behavior as user mouseover and drop down sub-menu appears. but as on mobile screen hover feature don’t work and i simply hide the sub-menu on mobile resolution.
But as we can see in WP dashboard the sub menus converted with clickable feature and we can access the sub-menu by clicking the parent.
how can i implement this feature in my theme?