Use of GeoCoord.system created with GeoGraphics in Bentley Map/PowerMap

Hi,

 I have some DGN-files where own Geo coord.system (GCS) are stored. The Geo Coordinate sYstems was created with the Geographics 8.5 Datum editor (Bursa Wolf 7 Shift).

Can I use this GCS in BentleyMap or PowerMap, with the Import GCS form Master oder Refernces, or do I have to create this GCS

in own libraries??

 Regards

Frank