First of all you have to make sure that IP-aliasing is built into your running kernel. See the kernel docs or the IP-aliasing HOWTO from the LDP for this. Next you've got to make sure that DNS is setup correctly and finally you ensure that your /etc/httpd/conf/httpd.conf file has the correct settings for the domain you want to alias.
A sample config for this would look like so:
<VirtualHost www.smallco.com>
ServerAdmin webmaster@mail.smallco.com
DocumentRoot /groups/smallco/www
ServerName www.smallco.com
ErrorLog /groups/smallco/logs/error_log TransferLog
/groups/smallco/logs/access_log
</VirtualHost>
<VirtualHost www.baygroup.org>
ServerAdmin webmaster@mail.baygroup.org
DocumentRoot /groups/baygroup/www
ServerName www.baygroup.org
ErrorLog /groups/baygroup/logs/error_log TransferLog
/groups/baygroup/logs/access_log
</VirtualHost>
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It is recommended that you use an IP address instead of a hostname for IP-aliasing.