Creating subdomains in cPanel is a breeze, you can setup subdomains within few clicks following the steps given below:

• Login into cPanel
• Click on subdomains option
• Give your subdomain a name like ‘blog’, 'app' etc
• Select domain from dropdown if your account hosts multiple domains
• Select document root path, by default a route with the subdomain name will be suggested (this will be a new folder within public_html folder
• Click create! Your subdomain is ready