Hi, @Ishank Tomer , after you add a new internal URL for you web application, you need to add a DNS entry in your AD and then edit the binding in the IIS.
For more detailed steps, please have a check on this tutorial:
https://howtodowithsharepoint.wordpress.com/2018/01/26/sharepoint-2016-how-to-implement-alternate-access-mapping/
https://spgeeks.devoworx.com/configure-alternate-access-mapping-in-sharepoint-server-2013/
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