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Custom fields are a good idea to let power users add targeted information data to most of the forms.
It works, as long as you remain in the same environment.

During implementation projects, we create fields to help user figure out what will be their live D365 FinOps, but when comes go live, all must be redone manually.
When you do some customization for interfaces, you must use devboxes and any developer must redo the job to create the custom fields. It comes that the function comes useless, as it is then quicker to create them the old way with extensions.

The ability to move custom fields to other environments would be a nice feature to enhance what is a good starting point
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