Configuring a child company

How to configure a child company separately in settings and adding users o the child company without affecting the user list of the parent company

Can you provide some more details about what you’re looking at?

You can follow the documentation for multi-company setup:

Users are added independent of the Company. Once you have the user list up, you can add user permissions to block users of one company from accessing the other:

that’s cool. I just tried this and it worked perfectly for me.