Yes, as an owner of the account, you can create multiple companies in CORE using the same login credentials. However, each company needs to be purchased separately and so you need to buy subscriptions for them separately. Also, you are prompted to choose the company you want to use upon login. You can switch to another company at any time. If you open multiple tabs of different CORE companies at the same time, CORE prompts you to close the other tabs before switching the companies. Please check with your Sales Account Manager to purchase the required subscriptions.