Creating a custom menu for a Google Sheets add-on using Google Apps Script involves writing JavaScript code to define the menu items and their corresponding functions. Here’s a step-by-step guide on how to do it:

1. Open Google Sheets and the Script Editor:

• • Open your Google Sheets document.

    • Go to Extensions > Apps Script.

• 2. Create a New Script:

  • In the script editor, you’ll see a default script file called Code.gs. You can use this file or create a new one by going to File > New > Script file.

• 3. Write the Menu Code:

  • Add the following code to your script file to create a custom menu:

    function onOpen() {
      var ui = SpreadsheetApp.getUi();
      // Add a custom menu to the Google Sheets UI
      ui.createMenu('Custom Menu')
        .addItem('First Item', 'menuItem1')
        .addItem('Second Item', 'menuItem2')
        .addSeparator() // Optional: adds a separator line
        .addSubMenu(ui.createMenu('Sub-menu')
          .addItem('Sub-menu Item 1', 'subMenuItem1')
          .addItem('Sub-menu Item 2', 'subMenuItem2'))
        .addToUi();
    }

    function menuItem1() {
      SpreadsheetApp.getUi().alert('You clicked the first item!');
    }

    function menuItem2() {
      SpreadsheetApp.getUi().alert('You clicked the second item!');
    }

    function subMenuItem1() {
      SpreadsheetApp.getUi().alert('You clicked the first sub-menu item!');
    }

    function subMenuItem2() {
      SpreadsheetApp.getUi().alert('You clicked the second sub-menu item!');
    }

4. Save and Test Your Script:

   • Save your script by clicking on the disk icon or going to File > Save.

   • Close the script editor and reload your Google Sheets document.

   • You should see a new menu called Custom Menu in the menu bar.

5. Authorize the Script:

   • The first time you run the script, you’ll need to authorize it to access your Google Sheets document.

   • Click on one of the custom menu items. You’ll be prompted to authorize the script. Follow the authorization steps.

6. Using the Custom Menu:

   • Once authorized, clicking on the items in your custom menu will trigger the corresponding functions defined in your script.

Conclusion

This basic example demonstrates creating a custom menu with two items and a sub-menu.

You can expand this by adding more items, sub-menus, and corresponding functions to handle various tasks within your Google Sheets add-on.

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