diff --git a/EInAPI.h b/EInAPI.h
index 4dbca75..d37e805 100644
--- a/EInAPI.h
+++ b/EInAPI.h
@@ -459,6 +459,7 @@ EIN_EXPORT BOOL __stdcall EgtShearGroup( int nId, const double vPnt[3], const do
 // Nesting
 EIN_EXPORT BOOL __stdcall EgtCreateFlatParts( int nType) ;
 EIN_EXPORT BOOL __stdcall EgtAdjustFlatPartLayer( int nLayerId) ;
+EIN_EXPORT BOOL __stdcall EgtCalcFlatPartDownRegion( int nPartId, double dH) ;
 EIN_EXPORT BOOL __stdcall EgtPackBox( int nId, double dXmin, double dYmin,
                                       double dXmax, double dYmax, double dOffs, BOOL bBottomUp) ;
 EIN_EXPORT BOOL __stdcall EgtPackBoxCluster( int nId[], int nCount, double dXmin, double dYmin,
diff --git a/EMkMachiningGeoConst.h b/EMkMachiningGeoConst.h
index cb1ad58..1b57ffc 100644
--- a/EMkMachiningGeoConst.h
+++ b/EMkMachiningGeoConst.h
@@ -38,6 +38,13 @@ static std::string MCH_PV_RCUT = "RCUT" ;
 static std::string MCH_PV_RRCUT = "RRCUT" ;
 static std::string MCH_PV_RLICUT = "RLICUT" ;
 static std::string MCH_PV_RLOCUT = "RLOCUT" ;
+static std::string MCH_PV_DOWN_CUT = "DCUT" ;
+static std::string MCH_PV_DOWN_PRE_CUT = "DPRC" ;
+static std::string MCH_PV_DOWN_POST_CUT = "DPOC" ;
+static std::string MCH_PV_DOWN_RCUT = "DRCUT" ;
+static std::string MCH_PV_DOWN_RRCUT = "DRRCUT" ;
+static std::string MCH_PV_DOWN_RLICUT = "DRLICUT" ;
+static std::string MCH_PV_DOWN_RLOCUT = "DRLOCUT" ;
 // Chiave info con WidthT e DeltaT lama in Preview
 static std::string MCH_PV_KEY_WT = "WT" ;
 static std::string MCH_PV_KEY_DT = "DT" ;
diff --git a/EXeExecutor.h b/EXeExecutor.h
index 1cbe956..fc021c1 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -493,6 +493,7 @@ EXE_EXPORT bool ExeShearGroup( int nId, const Point3d& ptP, const Vector3d& vtN,
 // CreateFlatParts
 EXE_EXPORT bool ExeCreateFlatParts( int nType) ;
 EXE_EXPORT bool ExeAdjustFlatPartLayer( int nLayerId) ;
+EXE_EXPORT bool ExeCalcFlatPartDownRegion( int nPartId, double dH) ;
 // Box Nesting
 EXE_EXPORT bool ExePackBox( int nId, double dXmin, double dYmin,
                             double dXmax, double dYmax, double dOffs, bool bBottomUp) ;