In Lazarus 1.6 I could reorder menu items using drag'n'drop. It was no problem to move an item from one menu to another. Lazarus 1.8 uses a redesigned editor which doesn't support drag'n'drop. I can only move menu items up/down, but I haven't figured out how to move them to a different menu yet. Also I don't know how to convert a whole menu grup (e.g. "Edit") to a submenu of another menu group (e.g. "File > Edit").