Depending on your DNS provider, there are 2 options:

1. Setup DNS forward
Anyone who goes to http://projects.yourEP.com will be automatically
forwarded to http://www.oureasyprojects.net/yourEP

2. Setup DNS masking
Anyone who goes to http://projects.yourEP.com will always see
the http://projects.yourEP.com url and nothing else.
Please keep in mind that it won't work with Internet Explorer.