is it possible to configure an item custom field that will blank itself in the event the item record is copied?

I believe you need a workflow/script executing under the COPY entry point to clear it out. I do not think it is something you can do at the field level.

correct that's what we've had to do as well. Name the WF something generic like "Clear fields when copying" so it is able to be used for any further fields which may be created in the future.

well that’s interesting! good idea thank you