Building custom multi-level menus in Google Spreadsheet
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Does anybody know of a way to get more than a single level within a custom menu in Google Spreadsheet Apps Script?

In the <a href="https://developers.google.com/apps-script/class_spreadsheet#addMenu">documentation</a> it shows how to add a single level menu using `method addMenu(menuName, menuEntries)`. Can `menuEntries` be structured to give a menu hierarchy?

