It would be great if you would give some idea about the pages. Which type of pages do you want to as noindex? Because I'm not getting a clear view about the issue.
Apart from that, you can noindex the pages by disallow the Google bot to crawl the page. It will not permanently remove pages from the search, but will stop the Googlebot from crawling the pages. Then, you can allow the pages after updating the content in the future.
Format of the robots.txt file will be like this:
I hope, this will be helpful for you. Please feel free to contact for any query or issue.