You are correct: threaded holes are defined by tables contained in files with the extension .hol. The default location is load point\text\hole. You can easily add the holes you need by editing the table. You can either edit the default hole table (which means all users would see the same thing) or make a local copy and point to it using the hole_parameter_file_path statement in your config.pro
PTC has a good description of this on their website here: https://www.ptc.com/appserver/cs/view/solution.jsp?n=107248 or go to the Knowledge Base and search for 107248.
Note that the hole files are loaded into session as needed (i.e., nothing is loaded until you start defining a hole). Therefore, if you edit the hole file after you have already loaded the file into your current session, you may need to exit ProE and restart in order to see the changes.
