A subdomain is an additional part of your primary domain. Please, follow this tutorial to remove a subdomain in cPanel.
Steps to remove a Subdomain in cPanel
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Log in to your cPanel account.
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In the Domains section, click on Domains.
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Locate the Subdomain you want to remove and click Manage next to it.
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Scroll down, click on Remove Domain, and confirm the removal.
You should see a message that your Subdomain has been removed.
