List parameter options when calling a function

[Kaziglu Bey]

MultiplyClass

Function Multiply(number As Integer)
    Debug.Print number * 2
End Function

Module1

Option Explicit

Public Test As MultiplyClass

Public Sub TestClass()
    Set Test = New MultiplyClass
    Test.Multiply (2)
End Sub

The above example (a much smaller representation of my code) prints 4 to the immediate window. What I'd like to do is set the code up to inform the user values of 2, 4, & 6 should be passed (intellisense?).

I tried to use Enum, but was unsuccessful. If someone could help that would be great.