How to define a custom projection?

We use a "local" coordinate system that is a "shifted and rotated" State Plane projection. How would I define that (or can I)? I can make a "copy" of the State Plane projection into a custom .dty file, but how/where do I apply the rotation and shift parameters?
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  • Why do Bentley remove software parts (geodectic datum and ellipsoid editor) they already had in

    earlier products (Geographics!!!)

    It seems stupid!

    Regards

    Frank

    Regards

    Frank

    since 1985: GIS, CAD, Engineering (Civil)  Senior Consultant : [Autodesk Civil 3D , Esri ArcGIS, VertiGIS: in previous days : Bentley MS V4 - V8i, GeoGraphics, Bentley Map V8i, InRoads,  HHK Geograf, IBr DAVID] :  Dev: [C, C++, .NET, Java, SQL, FORTRAN, UML]
    [direct quote by: http://en.wikipedia.org/wiki/Helmut_Schmidt]: "Wer Kritik übel nimmt, hat etwas zu verbergen"
    Wer Grammatik- und/oder Rechtschreibfehler findet, der darf sie behalten :-)

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