copy an 2d array to another 2d array using an pointer

i've an POINTER WHICH POINTS TO AN 2D ARRAY" A" I WANT TO COPY THE ARRAY DATA TO ANOTHER 2D ARRAY "B" HOW DO I DO IT I NEED TO DO IT USING THE POINTER ITSELF SINCE I DON'T HAV ANY OTHER ACCESS TO ARRAY "A". HOW DO I DO IT IN C PLZ HELP IM NOT THT GREAT IN POINTERS