For get what I said about changing the subtype.
That will get rid of the parameters but then the object will not be recognised as a "Window" and can't be placed with the window tool.
Not so important with regualr objects but not advised for tool specific objects (doors, windows, stairs, markers, etc.).

I just move them all down to the bottom of the parameter list and hide them from the user.

Barry.

At the risk of giving away state secrets...

If you close the archicad project and remove the subtype from the library. Then when you restart ArchiCAD the subtype will display "Missing" all the parameters will still be present and can now be changed or a different subtype can be selected without deleting the existing parameters. Don't forget to restore the subtype to the library when done.

Finally, to give credit where it is very very due, this is and idea presented in Andrew Watson's GDL Handbook. The book is very good and well worth getting for those of us that play with GDL.