QB Issue Resolution:
By buying an additional subscription. You can use your existing intuit account or start a new one.
Resolution for Issue 'How do you add another company to my quickbooks' available: Yes (Solved).
Source: Intuit Community forum.
How do you add another company to my quickbooks: 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.
Support for CompanyQuickbooks Repair Pro will resolve it efficiently and affordably. Guaranteed resolution of your issue, or you pay nothing!
Error Recovery for Company [Canada]
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