Here's some code which creates a grid of dynamic text boxes, in the manner you describe.
code:
NUM_ROWS = 4;
var layer = 1;
var txt;
for (var z = 0; z < NUM_ROWS; ++z)
{
_root.createTextField('tfa_'+z, layer, 10, z*30, 100, 30);
txt = _root['tfa_'+z];
txt.text = "Row: " + z + ": " + "A";
layer++;
_root.createTextField('tfb_'+z, layer, 150, z*30, 100, 30);
txt = _root['tfb_'+z];
txt.text = "Row: " + z + ": " + "B";
layer++;
_root.createTextField('tfc_'+z, layer, 300, z*30, 100, 30);
txt = _root['tfc_'+z];
txt.text = "Row: " + z + ": " + "C";
layer++;
}