Installing a new page on a sub-domain

Hi,

I know this has been asked previously but non of the answers I saw really answered the question I have.

We have a website which has been active for a few years. The website owner has asked that we add two sub-domains, one for his staff and one for his customers… each page requires a page building that will hold some code so they can login to a third party system.

Ideally, what I’d like to do is make two pages and then have them show on the subdomains. Is this possible and if so, how do I do it?

Thanks!