QB Issue Resolution:

open the customer center, click on the customer, click the edit pencil next to the customer name and create the customer custom field

as I understand it enterprise is limited to 30 total custom fields, but a customer is limited to 12 custom fields

Resolution for Issue 'As I need to create a custom field in customer account record, can anyone help me to identify the steps that we need to follow to create a custom field?' available: Yes (Solved).
Source: Intuit Community forum.

As I need to create a custom field in customer account record, can anyone help me to identify the steps that we need to follow to create a custom field?: 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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