typedef CGAL::Polyhedron_3<Kernel, CGAL::Polyhedron_items_3, CGAL::HalfedgeDS_list> CgalPolyhedron;
typedef CGAL::AABB_tree<Traits> AABBTree;
typedef CGAL::AABB_face_graph_triangle_primitive<CgalPolyhedron> IntersectionPrimitive;
typedef CGAL::AABB_traits<Kernel, IntersectionPrimitive> Traits;
typedef CGAL::AABB_tree<Traits> AABBTree;
typedef boost::optional<AABBTree::Intersection_and_primitive_id<Kernel::Segment_3>::Type > SegmentIntersection;
typedef boost::optional<AABBTree::Intersection_and_primitive_id<Kernel::Plane_3>::Type> PlaneIntersection;

Kernel::Plane_3 cgalPlane(origin, normal);
//pCGALPoly is my loaded model and its class is CgalPolyhedron defined above
AABBTree tree(faces(*pCGALPoly).first, faces(*pCGALPoly).second, *pCGALPoly);
auto anyIntersection = tree.any_intersection(cgalPlane);

//Taking the first face and halfedge computed by intersection test
CgalPolyhedron::Face_handle aFace = anyIntersection->second;
CgalPolyhedron::Halfedge_handle aHalfedge = aFace->halfedge();

//Cutting the plane
polyhedron_cut_plane_3(*pCGALPoly, aHalfedge, cgalPlane);