QB Issue Resolution:

You cannot have multiple businesses in the same QuickBooks Online account.  You CAN have multiple accounts under the same login though.  You would need to sign up for a separate subscription for each company,.

Resolution for Issue 'Can I have multiple businesses on quickbooks? How?' available: Yes (Solved).
Source: Intuit Community forum.

Can I have multiple businesses on quickbooks? How?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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