Drop down menu

Greetings to allLet me start by saying I'm a new user and when I say new I mean NEW(fresh off the boat, new arrival...You get the point)I've been commissioned to build a course using Lectora. My first frustration is I'm trying to build a tree-like navigation menu. The drop down menu packaged with Lectora has sub menus but it builds them going acrossed as oppose to a tree.My question is it something I'm not doing correctly? are there any examples I can see or should I just keep pulling my hair out.Thanks in advanced.