We are investing in another company from our high interest account how would I set up a new account (not bank account) but an appropriate coding Thanks

Hello Granniae50, 

To create a new company in QuickBooks Online you will need a separate subscription. You can choose which subscription (Simple Start, Essentials, or Plus) you will need for this company by viewing our product comparison on our link below. Once you have chosen, select buy now & save or take the free trail - one the screen that appears select 'Already have a QuickBooks Online account ? Sign-in' and subscribe with your existing email address. Continue with the on-screen set up to select your business type which will generate a default chart of accounts. 

https://quickbooks.intuit.com/uk/

Once set-up you will then be able to switch between the companies by going to the Cog Wheel > Switch Company. 

Thanks