On the Odoo18 platform, As seen in the picture below, you may access the Manage Companies option as well as other company-related features by going to the Settings module, where you will find the menu. There, you will also find a clearly marked Companies tab.
In Odoo18, You can create company, for this navigate to “Settings” of the Odoo18. Under the “General Settings” tab, Under Companies section click Manage Companies.
To create a new company, navigate to Settings app ‣ Companies section, and click Manage Companies. Then, click New to create a new company.