I'm not sure if there are any other options than setting the values directly to the number col edit boxes and then "clicking" the button
Names Default To Here(1);
dt = Open("$SAMPLE_DATA/Nonlinear Examples/CES Production Function.jmp");
obj = dt << Nonlinear(Y(:"log($ value)"n), X(:Model), Finish);
obj << SSE Grid;
ob = Report(obj)[OutlineBox("Specify Grid for Output")];
tb = ob[Table Box(1)];
mins = {0, 1, 2, 3};
maxs = {1, 2, 3, 4};
points = {10, 12, 13, 14};
tb[2] << Set(mins);
tb[3] << Set(maxs);
tb[4] << Set(points);
ob[Button Box(1)] << Click(1);
-Jarmo