void CombineSelectionInPlace ( const [FGeometryScriptMeshSelection](API\Plugins\GeometryScriptingCore\GeometryScript\FGeometryScriptMeshSelection) & SelectionB, [EGeometryScriptCombineSelectionMode](API\Plugins\GeometryScriptingCore\GeometryScript\EGeometryScriptC-_1) CombineMode )