QB Issue Resolution:

The steps that Kristine shared are correct. The reason why you may not be able to add the Custom Field option is because that feature is only available on QuickBooks Online Plus and the Essentials subscription plans. Which plan are you currently on?

 

The good thing is that QuickBooks Online offers alternative ways to customize you sales forms. Check out this article for more info: How to customize invoices, estimates, and sales receipts. Let me know if you have questions. I’m here to help.

Resolution for Issue 'Adding fields to invoices' available: Yes (Solved).
Source: Intuit Community forum.

Adding fields to invoices: 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.

Support for custom field
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Error Recovery for custom field [Canada]
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