When you create a document-level customization for a document, all the copies of the document will be customized too. Even if you save a copy of the document with a different name, when the document is opened it’ll try to find and run the code. All the saved data will still be there, it’ll just pop up an annoying error message.
In this video I show a couple of ways to remove a customization from a document before you send it to someone.
Duration: 2 minutes, 19 seconds