I was just experimenting with the Property Tab Builder to make a nice interface for naming/numbering my part files. I think it is convenient to have two text fields which display the file name and configuration, but without creating part properties. The Tab Builder would not let me use two empty property names (which do not create part properties like non-empty fields like 'Name' or 'PartNo' do), but I found that I could open the .sldprt template file and edit the XML, forcing a null property name for more than one field.
Does anyone know more details about this format? Are there any other tricks which are not available in the Tab Builder, such as two fields modifying Global and Config properties of the same name?