How to setup multiple url for a single frappe directory site

i have a frappe directory plcm
and i have a site in it ngplcm.realgroup.org i have many developments i it
i want to change the url to someting else and want to run the same database and doctypes in different URL

if i create multiple sites will it share same instances like my original site

i have many doctypes related to different URL in my ngplcm
now i want different url for them

or how can i handle redirect that if a user login from the url he will redirect to the instance of that site

example - i have a usecase
i have a frappe directory setup in v15 with site name ngplcm.realgroup.org
i have 2 custom module def in it Realify and PLCM
for plcm work any user will login from ngplcm.realgroup.org
for realify related work he will login to realify.realgroup.org

the instance will be same as plcm
all database, users, employees, and all other doctypes should be same in both

but when user will hit from different url he will be redirected to /plcm for ngplcm and /realify for realify

this is only one usecase i have 3 more sites work done in the same instance /helpdesk, /log, /lab etc.

how to do this in frappe and how to handle it in production
right now i have development environment

I’m not sure what PLCM is.

If you’d like the function of web site alias, take a look at Custom Domains.

PLCM is Plant Lifecycle Management
a software for all plant related maintenance and machine records filling

i want to run the same frappe site with multiple domains.

Did custom Domains meet your needs?

I think you may need to understand the hierarchy.

Each site typically has a unique database (not shared between sites).
You can have multiple domains point to the same site using Custom Domains.

Why do you want multiple domains pointing to the same site, is this just a vanity
mechanism (superficial without functional consequences)?

yes custom domains can work for me

i want to setup multiple domains for the same site to make it a all way solution needs website for my users

as it has plcm and other things like visitor pass and log entry
for everything i want the data to be integrated