We appreciate your decision to read the manual before request for our support.
Helix3 has a built-in mega menu that can be enabled in the main menu. One of new and unique features of Helix3 is new MegaMenu Generator. It can be used after first saving of menu item or in current menu items. But first check what you have it inside before that clicking.
Once Menu item is saved you can check this tab again. You should notice a new advanced Helix MegaMenu Options. From here, you can select a module and drop inside this menu item as a submenu.
You can use module from list of published in Module Manager. It means that if you want to add a new one into menu, it must be listed there as a published, position name is not required to work.
You can choose column layout, which allows you to set menu items in selected positions. To get this feature use "Manage Layout" option (blue button).
Using: Left, Center, Right and Full buttons you can control appearance of dropdown submenu.
Building a two or three columns SubMenu is quite easy process - all starts from Menu Manager, where you have to add all those sub menu items. Here is example structure to get 3 columns menu for Home.
Of course we suggest to use your own menu items types for real items like Single Article or chosen Component view. And Text Separator is great for showing titles of menu sections. Remember that in Helix MegaMenu Options you have to refresh appearance of menu structure to get final result - like in following example.
And the final result should be similar to following example.