If you need support from Yola please contact us via firstname.lastname@example.org or make use of our live chat service! We are working on a new approach to community-based support and during this transition period we are not adding any new threads to this forum. Many thanks to everyone who has participated over the years and we look forward to unveiling a new peer-to-peer support system soon!
I'm afraid that Yola Support won't have the capacity to assist you with this. But maybe one of our power users like Shawn Holman will be able to help you though he hasn't been much around on the forum for a while. You could try and ask him on this thread: April Code Requests.
Otherwise you may want to reconsider the navigation structure of your website. Having a main navigation, submenus, and drop down menus from the submenus could be a bit overwhelming and confusing for visitors to your site. It may be better to link with text and picture links from your submenu pages to your further pages. You could design them creatively using our Custom Panel Widget and icons/pictures which you add like a menu to a submenu page. Just a thought. :-)