Looking at your request it appears that you ready want to tag parts with specific information. You could edit the part by adding text to a subclass you know you will not use in your final ouput. For instance type in comments on the Body Center layer of the part. Of course if you want to read info on a small part and there are many of them placed close together you will have to temporarly move the part.
Thanks for your reply. I ended up finding out how to add properties through Setup -> Property Definition and went that route.
I did not want to add a subclass as the information I want to add is not graphical.
Thanks again for your relpy.