Hello Deba, FYI: If you use "LD000" as constant this will add with each number, means when gets 10-99, this will become, LD00010, when gets 100-999 will become LD000100. If you want to keep the format, "LD0000", 1-9 - LD0001, 10-99 - LD0010, 100-999 - LD0100, 1000-9999 - LD1000, here is one way. A3, then copy down. =IF(B3<>"",TEXT(COUNTA(B$3:B3),"\L\D0000"),"") Hope this helps, Haseeb
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