How do I copy cells with relative references into other cells kepping the
same references? e.g. cell A3 has the formula A1+A2. A6 has the formula
A4+A5. I want to copy A3 and A4 into A15 and A16 in order to have A15 with
the formula A1+A2 and A16 with the same formula as A6 (A4+A5).