To create a subdomain in cPanel, follow the steps below

1.Login to cPanel

2.Go to Domains section and click Subdomains

3.On the form provided, Subdomain under Subdomain area, type in your subdomain name. Example, if you need blog.truehost.top, type in blog

4.Allow 1 minute for the subdomain to be created.

Video

Below is a video of the same.