A TableBox is comprised of mutiple StringColEditBox and NumberColEditBox display boxes. You can add and remove elemets to these column display boxes.
However, it might be easier to insert and delete rows. This is a modification of Scripting Index scripts.
Names Default To Here( 1 );
New Window( "test",
tb = Table Box(
scb1 = String Col Edit Box( "string col", {"a", "c", "d", "d", "e"} ),
ncb1 = Number Col Edit Box( "number col", {1,2,3,4,5} )
)
);
wait(2);
tb << delete row(2);
tb << insert row( 2, {"b", 2} );
tb<<delete row(3);
tb << insert row(3, {"c", 3});