can anybody using Bentley map select series 4 help with datum files

Question

We in Australia will be soon required to use MGA2020 for cadastral survey, but this datum selection is not available to me in MicroStation V8i ss4. 
 I've been told it is available in Bentley Map SS4 which we don't have .. If it is could somebody copy and post or PM me or email me the necessary files that I could copy into MicroStation V8i ss4. as if it was a custom datum. 
 We don't have map and wont move to CE for a while yet as the local DOT here haven't adopted CE yet and not updated all their standards and templates...

Mark Shamoun · Answer

Hi Lorys, 
 
 For the benefit of others, I was able to get the CE Update 11 GDA2020 Geographic Coordinate System files to v8i (SS4) by the steps below: 
 
 I activated Bentley Map (included with Civil products) to copy the CE GDA2020 GCS entries into a Custom Geographic Coordinate System library (treated like an upgrade - https://docs.bentley.com/LiveContent/web/bentley%20map%20help-v2/en/GUID-8B7AA47A-4DA2-8E97-A7BB-2033750877A1.html ) 
 Copied datum.dty from CE and updated GenGridToWgs84.gdc to read MGA2020 shift files ) https://communities.bentley.com/products/geospatial/desktop/f/bentley-map-forum/106540/make-custom-shift-grid ). 
 I then added the MS_GEOCOORDINATE_USERLIBRARIES variable to my workspace to read the custom dty files on startup.

Here are the Geographic Coordinate System Custom Library files that go in your "C:\Program Files (x86)\Bentley\MicroStation V8i (SELECTseries)\MicroStation\GeoCoordinateData\" folder and some info about variables to add to you configuration: 
 https://www.dropbox.com/s/tqjlvo21c55n0z8/MS_v8i_GDA2020.zip?dl=0

Please note that Map is only required to change co-ordinate system data not to read custom data so all should be fine. These files produced identical results for the same dataset between CE and v8i so i'm pretty confident it works well, but suggest some testing before using on project data.