diff --git a/EgkCurve.h b/EgkCurve.h
index 65b7b82..a432e89 100644
--- a/EgkCurve.h
+++ b/EgkCurve.h
@@ -30,6 +30,10 @@ class _declspec( novtable) ICurve : public IGeoObj
       virtual bool GetPointTang( double dU, Point3d& ptPos, Vector3d& vtTang) const = 0 ;
       virtual bool GetPointTangNormCurv( double dU, Point3d& ptPos, Vector3d& vtT, Vector3d& vtN, double& dCurv) const = 0 ;
       virtual bool Reverse( void) = 0 ;
+      virtual bool TrimStartAtParam( double dUTrim) = 0 ;
+      virtual bool TrimEndAtParam( double dUTrim) = 0 ;
+      virtual bool TrimStartAtLen( double dLenTrim) = 0 ;
+      virtual bool TrimEndAtLen( double dLenTrim) = 0 ;
 } ;
 
 //----------------------------------------------------------------------------
diff --git a/EgkCurveBezier.h b/EgkCurveBezier.h
index 00331fb..e720e56 100644
--- a/EgkCurveBezier.h
+++ b/EgkCurveBezier.h
@@ -15,6 +15,8 @@
 
 #include "/EgtDev/Include/EGkCurve.h"
 
+class ICurveArc ;
+
 //----------------------------------------------------------------------------
 class _declspec( novtable) ICurveBezier : public ICurve
 {
@@ -22,6 +24,7 @@ class _declspec( novtable) ICurveBezier : public ICurve
       virtual bool Init( int nDeg, bool bIsRational) = 0 ;
       virtual bool SetControlPoint( int nInd, const Point3d& ptCtrl) = 0 ;
       virtual bool SetControlPoint( int nInd, const Point3d& ptCtrl, double dW) = 0 ;
+      virtual bool SetFromArc( const ICurveArc& crArc) = 0 ;
       virtual int  GetDegree( void) const = 0 ;
       virtual bool IsRational( void) const = 0 ;
       virtual const Point3d& GetControlPoint( int nInd, bool* pbOk = NULL) const = 0 ;