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Hi Ramon, Thanks for your detailed response. I could do both the above things you mentioned but there is a basic problem: there is no webmasters account for the old sub-domain. Only if I have webmasters - I can remove the URLs manually/automatically. Can I remove sub-domain URLs from main domain webmasters? What other options do I have to go about doing this - create new webmasters? (Verification would be an issue then)

Hi there. Good backlinks, social media engagement, interlinking and more traffic to those pages (with good engagement metrics of course) are your friends here

Hi Mike, Great! Do not worry, I know about the issues with the Spanish accents. You are absolutely right. Your answer is very complete, with all the options available. I have only mentioned, the cross linking, assuming that all the other options were already tried. Which might be not be true nor the best option as a start. Specially if the practitioner does not have experience enough. Mª Verónica