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Extra fields are just that, extra. You only create them when the data you want to handle does not exist anywhere else in the product. If you can handle the data properly with attributes, you don't...

You would need to save any modified admin files, and compare, merge (if necessary), and reinstall them. The db changes should carry over.

Just for the record, re: post 19 (product details list and not getting your new field to display by itself), before the output <ul> section there is an if() test which only displays the list if one...