diff --git a/EExImport3MF.h b/EExImport3MF.h
index 7cb15f8..935108a 100644
--- a/EExImport3MF.h
+++ b/EExImport3MF.h
@@ -29,10 +29,13 @@ class __declspec( novtable) IImport3MF
 {
    public :
       virtual ~IImport3MF( void) {} 
-      virtual bool Import( const std::string& sFile, IGeomDB* pGDB, int nIdGroup) = 0 ;
+      virtual bool Import( const std::string& sFile, IGeomDB* pGDB, int nIdGroup, int nFlag = 0) = 0 ;
 } ;
 
 //-----------------------------------------------------------------------------
 extern "C" {
    EEX_EXPORT IImport3MF* CreateImport3MF( void) ;
 }
+
+enum EIm3MFFlag { EI3FLAG_NONE =          0x0000,
+                  EI3FLAG_KEEP_GROUPS =   0x0001} ;
diff --git a/EXeExecutor.h b/EXeExecutor.h
index 25ee0a6..6ed1963 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -125,7 +125,7 @@ EXE_EXPORT bool ExeImportDxf( const std::string& sFilePath, double dScaleFactor)
 EXE_EXPORT bool ExeImportPnt( const std::string& sFilePath, int nFlag) ;
 EXE_EXPORT bool ExeImportStl( const std::string& sFilePath, double dScaleFactor) ;
 EXE_EXPORT bool ExeImportOff( const std::string& sFilePath, double dScaleFactor) ;
-EXE_EXPORT bool ExeImport3MF( const std::string& sFilePath) ;
+EXE_EXPORT bool ExeImport3MF( const std::string& sFilePath, int nFlag = 0) ;
 EXE_EXPORT bool ExeImport3dm( const std::string& sFilePath) ;
 EXE_EXPORT bool ExeAdvancedImportIsEnabled( void) ;
 EXE_EXPORT bool ExeAdvancedImport( const std::string& sFilePath, double dToler = 0.1, int nFlag = 0) ;