Hello @nirajbari,

The creation and management of subdomains for website is actually dependent to your Hosting Service provider and not in any way controlled by the theme.

Please refer to your website hosting service provider for more info on subdomains.

Also, the support forum is dedicated to provide support for theme related queries, issue and bug fixing. Please post your theme related queries in the theme specific support forum so that we could help you with some precise fix.

Hope you would understand,

Best Regards !!