VBA Class() object as property of another class
When you myQuotes.Quote(3) you call Property Get Quote which has an issue.
Your internal array of Class2 is not instantiated so pQuote(Index) refers to an array element of Nothing, when you then myQuotes.Quote(3).OTC = you try to assign to Nothing which fails.
You need to make sure pQuote(Index) is instanced; you can do this on demand:
Public Property Get Quote(Index As Integer) As Class2 If (pQuote(Index) Is Nothing) Then Set pQuote(Index) = New Class2 Set Quote = pQuote(Index)End Property(Note the required Set)
Or by adding an intitialisation routine to Class1:
Private Sub Class_Initialize() Dim Index As Long For Index = 0 To UBound(pQuote) Set pQuote(Index) = New Class2 NextEnd Sub