How to set up an NS record of one domain to access a folder of another domain?

Question

Domain Name System

Hello. There is a boxed version of Bitrix 24 which is available at cloud.brz.su
on Bitrix there is an online store which is available at cloud.brz.su/lego.
We bought our own domain 5robo.ru/ for the store, so it remains to make the site work at the new address.
What actions need to be taken with a domain registrar or hosting? Thank you very much.

Answer 1

There is an option:
Or another option:

cloud.brz.su    A     127.0.0.1
5robo.ru         A     127.0.0.1

But in both cases, it is necessary to explain to the web server that it hosts both of these sites.
Oh, and one more thing - in HTML pages, URL addresses must be universal, without the DNS name of the site,
i.e. not " cloud.brz.su/index.html ", but "/index.html". Otherwise, the browser will jump from one site to another.