New to arrays-Convert 1D array to 2D (Need help on 1 line of code)

I am trying to convert a 1D array to a 2D. Below is where I am up to so far. I just need help with the Redim Preserve line. Can any of you nice array experts help out please?

Public Function Convert1DArrayTo2D(varArrayInput As Variant) As Variant
    Dim iCol As Integer
    Dim varArrayOutput As Variant

'   determine if input array is 1D. If not, return output same as input
    If Not DetermineIfArrayIs1D_2D_OrMore(varArrayInput) = 1 Then
        Convert1DArrayTo2D = varArrayInput
        Exit Function
    End If

    ReDim varArrayOutput(LBound(varArrayInput) To UBound(varArrayInput), 0)

'   for each column in the 1D Input Array
    For iCol = LBound(varArrayInput) To UBound(varArrayInput)
'       copy data into Output Array
        varArrayOutput(iCol, 0) = varArrayInput(iCol)
    Next iCol

'   add one extra row to Output Array (will contain empty values)
    Debug.Print "it will crash on the next code line 'subscript out of range'"
    ReDim Preserve varArrayOutput(iCol - 1, 1) 'already tried ReDim Preserve varArrayOutput(iCol - 1, UBound(varArrayOutput,2)+1)

'   return function as Output array (transpose so array is in (rows,cols) format)
    Convert1DArrayTo2D = WorksheetFunction.Transpose(varArrayOutput)
End Function

Public Function DetermineIfArrayIs1D_2D_OrMore(ByVal varArray As Variant) As Integer
' returns number of dimensions as 1, 2 or 3 (3 is for anything above 2. I only have a practical use for determining the size below 3).
    Dim bytDimNum As Byte
    Dim varErrorCheck As Variant

    On Error GoTo FinalDimension
    For bytDimNum = 1 To 3
        varErrorCheck = LBound(varArray, bytDimNum)
    Next

FinalDimension:
    On Error GoTo 0
    DetermineIfArrayIs1D_2D_OrMore = bytDimNum - 1
End Function