QB Issue Resolution:

Customizing the Add/Edit list to see the columns you want, then using Copy Down, is much safer than export/import and really easy. You can do it and NOT hit Save, if you think you did in incorrectly.

Please see my screenshot.
Copy_Down.JPG

Resolution for Issue 'How to find data in a custom column of the Add/Edit Multiple List Entries Window.' available: Yes (Solved).
Source: Intuit Community forum.

How to find data in a custom column of the Add/Edit Multiple List Entries Window.: 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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