Are subdomains possible on a subdomain install of WP

Disclaimer:
I have searched the forums and read so much. the last reply to this was about 2 years ago so I thought I’d try. I have a network admin who can edit .htaccess and reload Apache at any time.

Question:
Are subdomains possible with a subdomain install of WP?
The install is at wordpress.domain.edu
Is subdomainname.wordpress.edu possible?

More Info:

WP 3.4.1
WordPress MU Domain Mapping is installed but not activated, I did not want to break something.

.htaccess:

# BEGIN WordPress
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

# uploaded files
RewriteRule ^([_0-9a-zA-Z-]+/)?files/(.+) wp-includes/ms-files.php?file=$2 [L]

# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule  ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L]
RewriteRule  ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]

# END WordPress

wp-config:

define('MULTISITE', true);
define('SUBDOMAIN_INSTALL', true);
$base = '/';
define('DOMAIN_CURRENT_SITE', 'wordpress-test.domain.edu');
define('PATH_CURRENT_SITE', '/');
define('SITE_ID_CURRENT_SITE', 1);
define('BLOG_ID_CURRENT_SITE', 1);

/** Absolute path to the WordPress directory. */
if ( !defined('ABSPATH') )
	define('ABSPATH', dirname(__FILE__) . '/');

/** Sets up WordPress vars and included files. */
require_once(ABSPATH . 'wp-settings.php');

Any help here is appreciated even a “Yes/Not Possible”. Thank you.