Domain point to a subdomain

[apinto]

Thanks, apinto! But if I use htaccess for the redirection, will the URL on my browser changed to destination domain name (in my case, xyz.abc.com)?

And when I click on the link at xyz.abc.com after htaccess redirection, for example contactus.php page, is it showing http://xyz.abc.com/contactus.php or http://xyz.com/contactus.php?

This is something you should try and see the results...

However the URL on the address bar will the destination one.
The URL will always be the destination one unless you specify otherwise.