Guideline to create the sub-domain using apache virtual host
Eg: mail.xyz.com that point to other document root /usr/share/horde



(1) Modify A/CNAME record in you domain NS server (or ask their administrator)
if NS server is used bind: 
xyz.com.        IN      A       222.111.222.33
www             IN      CNAME   xyz.com.
mail            IN      CNAME   xyz.com.


(2) 
vi /etc/httpd/conf/httpd.conf


NameVirtualHost *:80
NameVirtualHost *:443

<VirtualHost *:80 *:443>
    DocumentRoot /var/www/html
</VirtualHost>


<VirtualHost *:80>
    ServerName www.xyz.com
    ServerAlias xyz.com *.xyz.com
    DocumentRoot /var/www/html/xyz.com
    ErrorLog /var/log/httpd/xyz.com-error_log
    CustomLog /var/log/httpd/xyz.com-access_log combined
</VirtualHost>



<VirtualHost *:80 *:443>
    DocumentRoot /usr/share/horde
    ServerName mail.xyz.com
</VirtualHost>


(3)

/etc/init.d/httpd restart


(4) Try see in web http://mail.xyz.com/


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