Is there a fee PER every company for subscriptions or can you add as many companys under one subscription

One QBO account is for one company file. You may manage branches/divisions by utilizing the Class/Location feature available in QBO Plus and Advanced. Otherwise you should open a new account.

https:// quickbooks.grsm.io/US

https:// quickbooks.grsm.io/us-promo

Otherwise you should purchase QB Desktop. You may create and manage multiple company files with a one time license. Deploy a private cloud if required to access your file(s) by internet connection.