Change domain but keep website server

Hi everyone,

So i’ve searched the internet for quite a long time now but i can’t find the solution for my problem. Maybe it is very easy but i still don’t know what i need to do exactly. First i will describe my situation.

I have created a WordPress website, this website is on a server and has also other WordPress websites running on it. for example:

– WordPress website A;
– WordPress website B;
– WordPress website C.

My WordPress website is “WordPress website C” and is running on a test-domain (for example test.mydomain.com).

All these websites have the same nameserver (for example ns1-myhosting.com and ns2-myhosting.com).

Now i would like to transfer WordPress website C which is running on test.mydomain.com to a other domain for example “theotherdomain.com” and with that it is very imported to keep the website on the server where it is running now.

I read a lot about changing the nameserver settings. But i don’t know where to start. Do i need to change the nameserver settings at “theotherdomain.com” and if so how does this domain knows that it needs to read the files of WordPress website C and not A and B? Do i also need to change some WordPress settings like the WordPress Adress (URL) and Site Adress (URL)?

I hope i described my question good enough.

— Mark