QB Issue Resolution:

if you are within the first 60 days (90 for non-US accounts) of starting your subscription Log into your QBO account, then look at your home page URL, it ends with /homepage, replace the homepage with purgecompany and hit enter (this deletes everything in the accounting)

other wise you either delete everything one transaction at a time

Resolution for Issue 'i want all entery delet' available: Yes (Solved).
Source: Intuit Community forum.

i want all entery delet: 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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