wp_nav_menu change sub-menu class name?

Question

Is there a way to change the child

generated by WordPress itself to a custom class name?

I know the parent

Answer 1

in the above i need a small change which i am trying to place but i am not able to do that, your output will look like this

About Us

    
Sample Page
    
About Us


 

what i am looking for

About Us

    
Sample Page
    
About Us


 

in the above one i have placed the parent class inside the parent anchor link that