Managing multiple overlapping websites

I have two websites that are ostensibly copies of one another. One is the
public version (www.domain.com), the other is the private test subdomain
(www.test.domain.com).

On my development system I have the same scenario with the 2 separate
websites. The one website is, for tha lack of a better explanation, a stable
backup point. The other is the test/development site.

When finished developing I publish the tested code to the
www.test.domain.com. Easy enough. Once the committee ok's the test
development, I want to publish this to the www.domain.com.

My problem is that FrontPage only allows me to publish to the test subdomain,
which is without FP extensions. But the latter I can ignore if I could only
later publish to the regular full domain from the test subdomain or
development test site.

FrontPage views the world like this:

[development backup] ------> [www.domain.com]

[development test] --------> [www.test.domain.com]

I need this;

[development backup] ------> [www.domain.com]
^
|
|
[development test] --------> [www.test.domain.com]

How is this done in the real world?

Thanks!

Randy

.