This how my vhost looks:

<VirtualHost misitio.com:80>
        ServerName www.misitio.com
        ServerAlias misitio.com *.misitio.com
        ServerAdmin miemail@yahoo.com
        DocumentRoot /var/www/misitio.com
        ErrorLog /var/log/apache2/misitio.com.error.log
        CustomLog /var/log/apache2/misitio.com.access.log combined

        <Directory />
                Options FollowSymLinks
                AllowOverride None
        </Directory>

        <Directory /var/www/misitio.com>
                Options Indexes FollowSymLinks MultiViews
                AllowOverride All
                Order allow,deny
                allow from all
        </Directory>
        LogLevel warn
        ServerSignature On
</VirtualHost>


I want to have this:

http://subdomain.misitio.com  living in    /var/www/subdomain
while my main site is
htttp://www.misitio.com    living in /var/www/misitio.com