Point domain to Phonegap port

Currently i've successfully pointed my website to my web-server on one subdomain. However; currently its being pointed to port 80 by default.

<VirtualHost *:80>
    ServerAdmin webmaster@localhost         
    ServerName coreapp.site.me
    ServerAlias www.coreapp.site.me
    DocumentRoot /var/www/coreapp/public
    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined
    <Directory /var/www/coreapp/public>
        Options Indexes FollowSymLinks
        AllowOverride All
        Require all granted
    </Directory>
</VirtualHost>

I'm looking to hookup the same domain with a different subdomain to :3000 for phonegap; where am I able to configure this?

I assume Phonegap has its own configuration and is not a part of Apache's configuration; i'm still quite unsure due to lack of documentation.

How am I to achieve this on an Ubuntu system?