Having the ability to control the UCS (User Coordinate System) is very important in the plant design environment.  The coordinates during scanning does not always match up with the plant design coordinates.  

Below are the steps you can use to establish a UCS inside cyclone if you have either Register or the Model module loaded.

1.  You need to establish two know points, a base point and an azimuth.  In this case I have picked two points on a foundation, pick 1 is the X,Y,Z, or N, E, Elev & pick 2 is the North direction (azimuth)

2.  Now go to View....>Coordinate System....> Set From Points

 3.  Fill in your known Coordinate data and North direction in this case 90 deg.  Click OK to view your new origin.