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# Excel : Auto Unique Number Generation

Hi Experts,

I need to generate unique number as per the following format...

This Unique Number comprises of 4 sections.
Suppose, Number is "E17100007" (which is unique)

1. E is first character from Column B
2. 17 is 2 digit Year from Date Column (C)
3. 10 is 2 digit Month from Date Column (C)
4. 0007 is four digit number which will grow by 1 within its group. (Consider that this number does not exceed 9999 limit)

Where group is 'E1710' and number will be get incremented but if group changes then it will start from 0001.

When I use this formula it reset all the numbers falls after it.

It should not be actually.

It should first find out the maximum and and then increment. All the previously generated numbers should intact.

How to achieve the task? (If it is VBA than it will be better)

Sample file is attached?

Regards,
D Patel
UniqueNumber.xlsx
VBAMicrosoft OfficeMicrosoft Excel Last Comment
Mike in IT

8/22/2022 - Mon
Mike in IT

If you want a VBA answer then you could use a User Defined Function (UDF) like this:
``````Function UniqueNumber(D As Date, Cat As String)
Dim Begin As Variant
Begin = Left(Cat, 1) & Right(Year(D), 2) & Format(Month(D), "00")
Dim Formula()
Dim Counter As Integer
Counter = 1
Formula = ActiveSheet.Range("E2:E" & ActiveCell.Row - 1).Value
For i = 1 To UBound(Formula)
If Begin = Left(Formula(i, 1), 5) Then
Counter = Counter + 1
End If
Next i
UniqueNumber = Begin & Format(Counter, "0000")
End Function
``````
Then to use it you will type this into the column that you want showing the results:
``````=UniqueNumber(C2,B2)
``````
And you will get a unique number for each group incrementing by 1.
SOLUTION
Subodh Tiwari (Neeraj)

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D Patel

@Subodh Tiwari (Neeraj) :

What if I insert record in middle of the list?

The formula will renumber all the list which falls after it.

Here I want the new number should be inserted.

D Patel

@ Mike in IT :

Number not generating (showing all groups as "0001")

please suggest if anything remain from my side.
Subodh Tiwari (Neeraj)

Why would you insert rows in between? But if want to insert the rows all you need is to copy the formula from the row above to down the rows that will update the unique numbers in the rows below .
D Patel

But once assigned the number should not change....
Subodh Tiwari (Neeraj)

I don't think that's possible as once you insert rows in between and fill the new rows, the formulas below will be automatically updated.