Function GetTestClass(lngClassNo as long) as Object

 Dim strClassName as String
 strClassName = "CTest" & CStr(lngClassNo)

 Set GetTestClass = New instance of class(strClassName)

End Function

Function GetTestClass(lngClassNo as long) as Object

    Select Case lngClassNo
    Case 1
        Set GetTestClass = New CTest1
    Case 2
        Set GetTestClass = New CTest2
    ...

    End Select

End Function

Function GetTestClass(lngClassNo as long) as Object

    Set GetTestClass = CreateObject("MyDll.CTest" & lngClassNo)

End Function

Public Function CreateInstance(typeName As String) As Object
    Dim module As VBComponent
    Set module = LazilyCreateMPCache()

    If Not FunctionExists(typeName, module) Then
        Call AddInstanceCreationHelper(typeName, module)
    End If

    Dim instanceCreationHelperName As String
    instanceCreationHelperName = module.name & ".GetInstanceOf" & typeName
    Set CreateInstance = Application.Run(instanceCreationHelperName)
End Function

Sub AddInstanceCreationHelper(typeName As String, module As VBComponent)
   Dim strCode As String
   strCode = _
   "Public Function GetInstanceOf" & typeName & "() As " & typeName & vbCrLf & _
       "Set GetInstanceOf" & typeName & " = New " & typeName & vbCrLf & _
   "End Function"
   Call AddFunction(strCode, module)
End Sub

Dim CTest() as New CTest
For n = 1 to 10
    Redim Preserve CTest(n)
    CTest(n).Name = "CTest" & CStr(n)
Next l