Separate entities under same site

ERPNext
1

Hello Team,
Is there any way to create a totally separate company under the same site with its own users, items, accounts etc . and to have a admin to setup and configure the company ?
I have created user and set permission to specific company. but still the user can see all the items in the system.

Is there anyway to achieve this ?

what are the details shared among companies under same site?

2

Have you applied user permission? User permission will restrict access to other company records.
https://docs.erpnext.com/docs/user/manual/en/user-permissions