Some of the applications require dynamic subdomains, where the content delivery is managed by the application code based on the URL. Such a scenario can be handled  by creating wildcard subdomain, this means any value of the subdomain accessed on the browser will route to a specific location / IP specified.

Here is how you can create a wildcard subdomain in cPanel (same can be achieved on other DNS providers if the domain is managed elsewhere).

How to create a Wildcard subdomain

• Login to cPanel
• Go to Zone Editor (DNS management incase managed elsewhere)
• Create an A record with the following
  • *.yourdomain.com (use your own domain name)
  • Select record type as ‘A’ record from dropdown / option
  • Type in the IP where you want to route all your subdomains

If you want to know how to set an A record, check zone editor guide.