Mega menu promotions is a block available in the Header section. It enables you to add a nice promo block to your mega menus.

To make use of it you first need to have at least one menu created in your “Online Store->Navigation”. Then in the “Theme Customizer”  in the “Header” section you select that menu to be your “Menu” and in the “Header->Desktop Menu Type” drop-down select “Mega Menu”. 

Once you do that all your navigation menu items that have at least one 2nd level submenu will be converted into a mega menu. For these navigation menu items, you’ll be able to add promotion blocks.

To do that add the “Mega Promotion” block to the header and in the “Menu Item” field enter the name of the menu item to which you want to add the promotion. Please note that this is case sensitive and the names have to match perfectly.

Now you can add an image, title, subheading, and a link to where you want your promotion block to link to.