In AutoCAD P&ID, is there is a way to print off or list the class hierarchy defined in the Project?
There is no way to do this directly from inside the application. However, you can use a database browser to view the P&ID database. The class hierarchy is stored in the table PNPTables.
If you are using a SQLite database you can open the ProcessPower.dcf database using an application such as SQLite2009 Pro or SQLite Database Browser to examine and export the contents of the table PNPTables to excel."