subdomain mapping to specific page under the domain

Hi,

I am trying to use a subdomain on site. I need keep subdomain pointing to the page I’ve created on the website.

Website : https://www.afthaprogram.com

I need following scenario to be worked out on my application

https://about-us.afthaprogram.com
>>> pointing to >>> https://afthaprogram.com/about-us

https://help.afthaprogram.com
>>> pointing to >>> https://afthaprogram.com/help

I have configured subdomain and URL’s on plugin dashboard but it doesn’t seems to be working out for me.

Please provide any suggestion to get this work for me.

Thank you.