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I actually ran into a similar issue a while back. I was trying to create text that would be attached to the model. The model_name parameter was not sufficient automatically put the correct text in place. So I created a user parameter "NAME" as other's have suggested here, and then created a relation:
NAME=rel_model_name
With this format, you could use &NAME:att for your note, and you wouldn't have to update the user parameter "NAME" for each model. I only have one type of part setup this way, so most of my parts are not setup right for this.