Please note that the Cad Conform is an 3rd party addon for MicroStation that is produced by Altivasoft.
Products - CADconform
This add-on requires you to abide by standards defined within its operation. I would expect there are standards provided by Rio Tinto in their customization of Cad Conform.
I would suggest you get it contact with either Rio Tinto in relation to what changes can be performed within their standards or with Cad Conform.
RegardsAndrew BellTechnical SupportBentley Systems