Thank you very much.
My company's ProSteel version is 'ProSteel for AutoCAD 2016'. As per your information, I found the related folders (...\Program Files\Bentley\ProStructures Ss6R1\AutoCAD 2106\Prg) but there are no Help files. And there are some Examples in another folder (…\Program Files\Bentley\ProStructures Ss6R1\AutoCAD 2016\Samples\COM Macros).
Is it possible for you to send those files to me when you have time? Or where will I may get them (website)?
Thanks Johannes. I found them.