A subdomain is an additional part of your primary domain. For example, blog.example.com is a subdomain. Please, follow this tutorial to create a subdomain in cPanel.
Follow the steps to create a subdomain according to your cPanel theme:
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Jupiter
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Paper lantern
Create a subdomain on Jupiter
If you're using the Jupiter theme, access your cPanel account and click on Domains section:
Click on Create a new domain:
Enter the following information:
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Domain: enter the desired name for the subdomain
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Share document root: leave the checkmark empty
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Home icon: specify the directory for the subdomain files
Once it's good to go, click on Submit:
Once the subdomain is created, you can check information about it, remove it or create a redirection in the Domains section:
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Create a subdomain on Paper Lantern
1. Log in to your cPanel account.
2. In the Domains section, click on Subdomains. 
3. Under the Subdomain field, enter your subdomain name, such as demo. Select the appropriate domain from the drop-down list if you have several domains.
4. Click on Create.
You should see a success message that the subdomain has been created.
