stl nested maps

[pdk5]

I have put some kind of pseudocode for the issue I am facing

I have a hybrid map, I want to insert a particular element from this map to another map.

typedef std::map<int,int> MapOfInts;
typedef std::map<int,MapOfInts> HybridMapOfInts;

int main ()
{
  MapOfInts mymap;
  MapOfInts mylatmap;
  HybridMapOfInts myNewmap;
  MapOfInts::iterator it; 
  HybridMapOfInts::iterator itNew;

  mymap[5]=50;

  mylatmap[1]=10;
  mylatmap[2]=20;

  myNewmap.insert(std::make_pair(1, mylatmap) );  

  itNew = myNewmap.find(1);

//Following gives error, is there any efficient simple right way to do this ??
  mymap.insert(itNew->second);
}

Last line gives error , is there any efficient simple right way to do this ??