QB Issue Resolution:

Right click (control+click) on the company file and select move to trash, empty the trash.

Resolution for Issue 'How do I delete a COMPANY from my Quickbooks?' available: Yes (Solved).
Source: Intuit Community forum.

How do I delete a COMPANY from 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 Company
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Error Recovery for Company [Canada]
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