The “Identifier” or Field becomes available Everywhere, because you checkmark where it is “in use.”

You need to Populate that with the selection you intend to use it for, and that would be done using Add/Edit Multiple.

Using one of the provided fields works better, if it meets your needs. For instance, […]

Resolution for 'checkmark where issue: 'Can I add a custom field to all current customers and jobs?' available: Yes.

The checkmark where 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 checkmark where issue yourself by looking for a resolution described in the article. If it is a complex checkmark where issue or you are unable to solve the issue, you may contact us by clicking here or by using other checkmark where support options.

For more information about resolving issues related to checkmark where in Quickbooks/QBO or to get support for the issue 'Can I add a custom field to all current customers and jobs?', click the link below: