Multi-domain within one website?

[theepa]

At our company we have 4 main services, which we have productized, so we want our new website to have 4 primary pages.

We want to keep the same server and IP but use 4 different domains, 1 for each of the 4 main pages of the same website. All other (sub)pages apart from the main pages will keep using the actual domain we have.

We understand that this could be done with 5 different websites looking alike, but we would like to manage everything in the same wordpress.  How can this be done?

We are aware that a simple redirection can do the job but we would like keep using the new domain name for that specific page.