Need the ability to delete custom fields

Within IAM, you can create custom fields but cannot manage the fields you create. There needs to be a mechanism for deleting custom fields that are no longer needed, and there should also be a way to edit existing custom fields. There is a limit to the number of custom fields allowed, but if I want to then edit or remove fields that I either (1) created by mistake or (2) no longer need, there is no option for that. If I exceed the custom field limit, there are no options to fix it.