Class Menu

// Add a custom menu to the active spreadsheet, including a separator and a // sub-menu. function onOpen(e) {   SpreadsheetApp.getUi()       .createMenu('My Menu')       .addItem('My Menu Item', 'myFunction')       .addSeparator()       .addSubMenu(           SpreadsheetApp.getUi()               .createMenu('My Submenu')               .addItem('One Submenu Item', 'mySecondFunction')               .addItem('Another Submenu Item', 'myThirdFunction'),           )       .addToUi(); }