User-defined template attributes and Template Editor
User-defined template attributes are defined in the contentattributes_userdefined.lst file. By default, this file includes most of the user-defined attributes that are visible in the part properties dialog boxes. To use your own attributes in templates and reports, you should make a copy of the file, rename it appropriately, and add the necessary attributes to that file.
The contentattributes_userdefined.lst file is divided into two sections:
A list of attributes and the default settings:

A list of attributes assigned to content types:

1. The content type of the row in Template Editor
2. The attribute hierarchy in Template Editor
3. Customizable comments, such as the tab name in the user-defined attributes dialog box
4. The name of the user-defined attribute, the same as in the objects.inp file.
See also
Adding user-defined template attributes in Template Editor
Adding comments to user-defined template attributes in Template Editor
Adding hierarchy to user-defined template attributes in Template Editor