Creating Your Own Menu
Excel 2007 no longer has a menu (unless you call Home, Insert, Page Layout, etc., a menu), and you can't customize what's not there. Excel does still have context-sensitive right-click menus. However, unlike in previous versions of Excel, the user interface no longer provides a way to customize them.
But you can use the Quick Access Toolbar. For more details see Adding commands to the Quick Access Toolbar.