You can use the same account to submit both personal and business returns.  

Simply select personal or business when answering your onboarding questions. Please note that requests for preparation of business returns and personal returns must be submitted separately (i.e. you would go through onboarding questions for your personal return preparation, then go through them again to submit your request for business return preparation). Different credit cards may be entered at checkout if you would like to use your business card to pay for your business return and personal card to pay for your personal return. 

Only you will have access to the Pro preparing your business return. In the event you would like to share access with a coworker, we suggest you submit the request for your business return under a separate shared profile since your personal information is visible within the account you use to have your personal return prepared. 

You may submit the same kinds of jobs for different family members or for different businesses within the same profile... Again, please note any privacy and intended issues before doing so.