QB Issue Resolution:

No, you can not insert columns on any forms

nor is there the ability to create custom fields for an item, customer, vendor either – you are stuck with what intuit provides

Resolution for Issue 'For inventory, I would like to insert two columns to track some additional information for each item. Can this be done?' available: Yes (Solved).
Source: Intuit Community forum.

For inventory, I would like to insert two columns to track some additional information for each item. Can this be done?: 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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