QB Issue Resolution:

You need to go to Customize (Lists menu > Templates, Edit) and to the Additional Customization, to the Columns tab. Put in new Sequence Numbers. Qty can be Anywhere.

Resolution for Issue 'On a custom estimate I am trying to move the Qty data field to the left of the description field. Can I move it?' available: Yes (Solved).
Source: Intuit Community forum.

On a custom estimate I am trying to move the Qty data field to the left of the description field. Can I move it?: 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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