Sorry again Jeff, it was late last night when I posted, and I made another stupid error - I'd forgotten it was the columns that were headed alphabetically. Let's start again.
A1=1, B1=1, C1=1, D1=2, E1=2, F1=2. G1=3, H1=3, I1=3, J1=4, K1=4, L1=4, M1=5, N1=5, O1=5
then
A2=6, B2=6, C2=6, D2=7, E2=7, F2=7, G2=8, H2=8, I2=8, J2=9, K2=9, L2=9, M2=10, N2=10, O2=10
etc.
Is that possible, please ?
Tony