[support] Adding custom menus as submenus

Hi, I want to add a custom menu i have created called "the person" and later another menu called "the business" as an expandable sub menu to "primary links". I tried adding the menu as a new menu from the "menus" page, but then i couldn't get it expandable/colapsable and i could move it by placing weight on it, but not where i wanted it, which is under primary links. Is this something i'll have to have a completely different menu making module for or can you do it with the existing module? I want to be able to expand menus by clicking the parent link so as to avoid clutter. Did that make sence? Any help much appreciated. /Krister