diff --git a/EXE_Const.h b/EXE_Const.h
index e768dd4..6e26fdb 100644
--- a/EXE_Const.h
+++ b/EXE_Const.h
@@ -34,6 +34,7 @@ const std::string NST_EXT_ORIG_LAYER = "OutLoop.orig" ;
 const std::string NST_IN_LAYER = "InLoop" ;
 const std::string NST_ON_LAYER = "OnPath" ;
 const std::string NST_KEY_SIDEANG = "SideAng" ;
+const std::string NST_KEY_OFFSET = "Offset" ;
 
 // Per Sheets (Nesting)
 const std::string NST_SHEET_OUTREG = "SheetOut" ;
diff --git a/EXE_NstCreateFlatParts.cpp b/EXE_NstCreateFlatParts.cpp
index 2f1368c..849b465 100644
--- a/EXE_NstCreateFlatParts.cpp
+++ b/EXE_NstCreateFlatParts.cpp
@@ -878,11 +878,13 @@ ExeCalcFlatPartDownRegion( int nPartId, double dH)
      // determino ed eseguo offset
       double dSideAng ;
       if ( pGeomDB->GetInfo( nCrvId, NST_KEY_SIDEANG, dSideAng)  &&  abs( dSideAng) > EPS_ANG_SMALL) {
-         double dOffset = dH * tan( dSideAng * DEGTORAD) ;
+         double dOffset = 0 ;
+         pGeomDB->GetInfo( nCrvId, NST_KEY_OFFSET, dOffset) ;
+         double dCalcOffset = dH * tan( dSideAng * DEGTORAD) + dOffset ;
          ICurve* pCrv = GetCurve( pGeomDB->GetGeoObj( nNewId)) ;
          if ( pCrv == nullptr)
             return false ;
-         pCrv->SimpleOffset( dOffset) ;
+         pCrv->SimpleOffset( dCalcOffset) ;
       }
      // passo alla successiva   
       nCrvId = pGeomDB->GetNext( nCrvId) ;