QB Issue Resolution:

In QBDT versions, you simply create a new company file.  You can copy lists to the new company if needed.

Resolution for Issue 'I want to delete everything, all data, companies etc., and start fresh.How do I do that? Thanks' available: Yes (Solved).
Source: Intuit Community forum.

I want to delete everything, all data, companies etc., and start fresh.How do I do that? Thanks: 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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