How to write a custom Excel 2016 function that gets first two characters of cell if numbers?

Grab First Two Numbers
If the cell's first three characters are 01-, I want them to be picked up.
If the cell is blank, I want the function to show 00-.
Example-of-Function-Desired.jpg
LVL 1
Alex CampbellAsked:
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Ejgil HedegaardCommented:
Try this
=IF(ISBLANK(B9),"00-",LEFT(B9,3))&IF(ISBLANK(C9),"00-",LEFT(C9,3))&IF(ISBLANK(D9),"00",LEFT(C9,2))
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Alex CampbellAuthor Commented:
Sorry, I forgot to include Custom with function in the question.
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Ejgil HedegaardCommented:
Then you can use this

Function CombineText(rg As Range) As String
    Dim col As Integer
    If rg.Columns.Count = 3 And rg.Rows.Count = 1 Then
        For col = 1 To 3
            If rg.Cells(1, col) = "" Then
                CombineText = CombineText & "00"
            Else
                CombineText = CombineText & Left(rg.Cells(1, 1), 2)
            End If
            If col < 3 Then
                CombineText = CombineText & "-"
            End If
        Next col
    End If
End Function

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For row 9: =CombineText(B9:D9)
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Alex CampbellAuthor Commented:
I tried out the function, but when the 2nd column changed, the function didn't update.
Level2NotUpdated.jpg
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Ejgil HedegaardCommented:
Sorry, typing error.
Use this
Function CombineText(rg As Range) As String
    Dim col As Integer
    If rg.Columns.Count = 3 And rg.Rows.Count = 1 Then
        For col = 1 To 3
            If rg.Cells(1, col) = "" Then
                CombineText = CombineText & "00"
            Else
                CombineText = CombineText & Left(rg.Cells(1, col), 2)
            End If
            If col < 3 Then
                CombineText = CombineText & "-"
            End If
        Next col
    End If
End Function

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Alex CampbellAuthor Commented:
Great, thanks!
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