I have a structure that looks like this:

• TopPage1
  • TP1-C1
  • TP1-C2
• TopPage2
  • TP2-C1
    • TP-C2-C1
    • TP-C2-C2
    • ...
  • TP2-C2
    • TP-C2-C1
    • TP-C2-C2
      • TP-C2-C2-C1
    • ...
  • TP2-C3
    • ...
• ...

I would like the top node to be set the 2nd level page the is in the path of the current page.
That is the TPx-Cx Level.

So for example all pages below TP2-C2 (TP-C2-C1, TP-C2-C2, TP-C2-C2-C1, ...) would set the root of the menu to TP2-C2.

You are right.  I read right over this a few times:

 With - NodeSelector="{root},{skip},{depth}"

 {root} = +n for n levels down from the root menu towards the current page.  Does the job mentioned above.

So I have - NodeSelector="+2,0,0"

 Now one more challenge.  If I would like to include the the 2 level Parent and it's Children, but not include the Siblings of the 2 level Parent.

In my experiments I haven't found a way to get just the parent in the breadcrumb path.