Variant Array Of Arrays Of Differing Size

I am trying to develop some code to serve as an 'undo' for several macros that I have. They each take a selected range and perform some changes to that range. I have managed to make some code that will undo the last macro run but would like to make something that can go back several steps. To that end, I have started with the following code but am running into an issue when I need to use a variant array to hold multiple arrays of a custom defined data type:

VB:
Type SaveRange
Val As Variant
Addr As String

[Code] .....

This declares some public variables I'll need, each as an array so that I can iterate through several steps of do/undo using the undoIndex. I then use them to save each range I am about to change by calling the following macro within my actual data-manipulating macros:

VB:
Sub Save_RangeForUndo(rng As Range)
Dim i As Integer
Dim cell As Range

undoIndex = undoIndex + 1

[Code] .....

If you look at the last line here, this is my problem; I can't figure out how to properly use an array to hold each instance of OldSelection() for later referral. Just for completeness, here is my actual undo macro:

VB:
Sub Undo_Operation()
Dim i As Integer
OldWorkbooks(undoIndex).Activate
OldWorksheets(undoIndex).Activate

[Code] .....

I need to get this OldSlctVariant()() array to hold each instance of OldSelection() so that I can restore them for each consecutive undo. I'm not very familiar with the variant type and anything more than the basic use of arrays.