QB Issue Resolution:

If you wish to modify or edit your Item information, then, you may use the Add/Edit Multiple List Entries. You may pull this up by going to Lists menu> Add/Edit Multiple List Entries. This will give you the ability to modify your item information in one window.

Resolution for Issue 'How can we modify the format for all of our Item codes without changing each one manually?' available: Yes (Solved).
Source: Intuit Community forum.

How can we modify the format for all of our Item codes without changing each one manually?: 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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