QB Issue Resolution:

an opening balance for inventory comes from when you created the inventory item and on that item screen entered a qty on hand and a total value

one at a time, right on the item and select quick report, the first entry will be called an adjustment, double click on it to bring it up, use the menu edit>delete adjustment

Resolution for Issue 'Where do I correct wrong opening inventory quantity.' available: Yes (Solved).
Source: Intuit Community forum.

Where do I correct wrong opening inventory quantity.: 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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