google sheet script create a cistom menu
// Google Apps Scipt custom menu example code
function onOpen() {
  var ui = SpreadsheetApp.getUi();
  // Or DocumentApp or FormApp.
  ui.createMenu('Custom Menu')
      .addItem('First item', 'menuItem1')
      .addSeparator()
      .addSubMenu(ui.createMenu('Sub-menu')
          .addItem('Second item', 'menuItem2'))
      .addToUi();
}
function menuItem1() {
  SpreadsheetApp.getUi() // Or DocumentApp or FormApp.
     .alert('You clicked the first menu item!');
}
function menuItem2() {
  SpreadsheetApp.getUi() // Or DocumentApp or FormApp.
     .alert('You clicked the second menu item!');
}