Dear all Experts
I am Excel 2003 user, this is my 1st time in this forums. Hope your can help me to
solve the below problem.

1: How to make " Alphanumeric " to fully AutoFill after fillup the 1st cell manaully only ?
2: How to make the " Alphanumeric " auto jump to next row & continue the rest of the Alphanumeric ?
3: When the "Alphanumeric reach it maximum target, it will auto start with New Set of Alphanumeric ?
( For better understanding, kindly do refer to below attachment. )

Thank you in advance for your helping.

Click image for larger version. 

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