To create new company in SAP Business One, Go to SAP Business One Login screen, select change company, and click new from wizard. In the site user screen enter Site User ID and password. Click ok to open Express configuration wizard.  Enter the new company name in the field box, and select Chart of account and Base language for the new company .Click continue. Create new password for company and update. Now, the new company ID is created successfully. Go to Authorization group, Under User Setup screen to enable module access for the user.