How To Write Google Apps Script In C . Add custom menus, dialogs, and sidebars to google docs, sheets, and forms. We do this using google app scripts as follows: Google Apps Script Create Your Own Mail Merge Teacher Tech from alicekeeler.com To create a trigger, you need to select which function should be called (since our apps script has only one function, it has autoselected the function) Copy this function into your script editor (or create your own function) and then click run. Learn how to read, write, and manipulate data in sheets with the spreadsheet service.