Excel VBA to pad zeros in substring of string

I want to convert numbers to 3 decimal places for each number between the character ".".  For example:
itemno = convert itemno to =
itemno = 1.2 convert itemno to = 001.002
itemno = 4.0 convert itemno to = 004.000
itemno = 4.3 convert itemno to = 004.003
itemno = 4.10 convert itemno to = 004.010

These are item numbers in an engineering bill of material.

Is there a way to do this with a loop in excel vba?
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You can use this function:
Public Function cnv(A As String) As String
Dim Arr() As String, i As Integer
Arr = Split(A, ".")
cnv = ""
For i = 0 To UBound(Arr)
    If i > 0 Then cnv = cnv & "."
    cnv = cnv & Format(Arr(i), "000")
Next i
End Function

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ste5anSenior DeveloperCommented:
You need to split it and reassemble it.

Option Explicit

Public Function PadItemNumber(ANumber As String) As String

  On Local Error GoTo LocalError
  Dim Count As Long
  Dim Parts() As String
  PadItemNumber = ""
  Parts() = Split(ANumber, ".")
  For Count = 0 To UBound(Parts())
    PadItemNumber = PadItemNumber & "." & Right("000" & Parts(Count), 3)
  Next Count
  PadItemNumber = Mid(PadItemNumber, 2, 1024)
  Exit Function
  PadItemNumber = "#ERROR"
End Function

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SteveCost AccountantCommented:
A good answer from als315:

I would tend to use a very similar method apart from using Join at the end rather than concatenating in the loop:

Public Function cnv(A As String) As String
Dim Arr() As String, i As Integer

Arr = Split(A, ".")

For i = 0 To UBound(Arr)
    Arr(i) = Format(Arr(i), "000")
Next i

cnv = Join(Arr, ".")

End Function

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This may be easier to understand and add error handling into.
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