hide some but not all dropdown menu items

Hi,

I’m presently using a child theme of WPFolio and I have some menu items I’d like hidden at https://66.147.244.117/~petleyjo

I’ve managed to hide the children in the drop down menu in my css by doing

.children li a {
overflow:hidden;
}

but I was wondering if it was possible to also hide the drop down options under “Artist” (I want to hide ‘contemporary’, ‘sculpture’, ‘historical’) without also hiding the drop down option under “contact us”

So in simple, I can’t blanked hide all of my ‘li’ options because I’d still like some of the drop down menu functions to work.

I’ve tried something like :

.sfmenu ul li.page_item page-item-19 {
overflow:hidden;}

to hide the aspects of the “Artist” menu item but it doesn’t work.

Anyone know if this is possible? Or if I have to do this as a function?

Thanks!