This video details the steps to configure a cPanel & WHM server for reverse DNS with IPv4.
Documentation
https://documentation.cpanel.net/display/CKB/How+to+Configure+Reverse+DNS+for+BIND+in+WHM
https://documentation.cpanel.net/display/76Docs/Add+a+DNS+Zone
https://documentation.cpanel.net/display/76Docs/Edit+DNS+Zone