QB Issue Resolution:

Yes, one company means one subscription, so you need a new subscription for a new company

Yes, one company means one subscription, so you need a new subscription for a new company

Resolution for Issue 'can i add more than one registered GST company ?' available: Yes (Solved).
Source: Intuit Community forum.

can i add more than one registered GST company ?: 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 Company
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