I'm looking for a way to reference a row or column on both the left side and 
right side of a table formula that is "easily" manipulable.  

At first, I thought the hline references would work for me @I..@II, except they 
cannot be used on the left side of an equation.  I hoped that maybe named 
fields would work (^,_), but those are apparently value aliases and not 
location references.

Essentially, I want to keep a single table in which I can enter and calculate 
data, and limit the computation to start at a given row that I change as I go 
along.  Maybe I'm simply using the wrong tool for this, excel is certainly not 
capable; so if org-table isn't either, it certainly doesn't lessen it.

#+BEGIN_EXAMPLE

| F |  A |  B |  C |
|---+----+----+----|
| _ | tA | tB | tC |
|   |  1 |  3 | 42 |
|   |  2 |  4 | 69 |
|---+----+----+----|
| # |    |    |    |
#+TBLFM=@>$2=vsum(@tA..@II)::$tC=$-2+$-1

| F |  A |  B |  C |
|---+----+----+----|
|   |  1 |  3 | 42 |
| _ | tA | tB | tC |
|   |  2 |  4 | 69 |
|---+----+----+----|
| # |    |    |    |
#+TBLFM=@>$2=vsum(@tA..@II)::$tC=$-2+$-1

#+END_EXAMPLE




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