Add the following code snippet to the custom Javascript (or jQuery) field on Site Settings > Design:
$(document).ready(function() {
$('a.sub-nav-parent').attr('href', '#!');
});
How to make the sub-nav parent not click through to a separate page.
Add the following code snippet to the custom Javascript (or jQuery) field on Site Settings > Design:
$(document).ready(function() {
$('a.sub-nav-parent').attr('href', '#!');
});