This article explains how to create a new company/organization.
Step-by-Step Guide
Go to Setup > Organization Structure.
Select the unit under which you want to create a new company.
Click Create New > Company.
You can do it either from the ribbon menu.Or by right-clicking on the selected unit.
Fill in all the necessary details and Save the changes.
You can use Split View to see the structure and details at the same time.Your company is not ready. It will be located beneath the corresponding unit.
See also
https://adonishr.atlassian.net/l/cp/ZuaJ7G05