TreeView Help

I have simply been a manager too long! I am completely incompetent now.

I am trying to setup a TreeView in a spreadsheet. I am simply trying to understand how to create the various nodes. I can't seem to get any examples I have found through Google to work (for me).

My need is an example to establish something like:

Parent1
- Child1
--SubChild1
---SubSubChild1
--SubChild2
-Child2
Parent2
-Child1
-Child2
--SubChild1
---SubSubChild1
---SubSubChild1
...

Most examples I found are form-based VB examples. I simply couldn't get them to work. Tried something like:
(assume there is control tvwMain)

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This should take me 5, 10 minutes. I have tried, but I have failed. Any help? Thanks.

Every time I try the code above or something as simple as

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I get an error indicating the 'key is not unique'