Thanks whatsup,
I wasn't aware about the distinction between the 2. So no, I guess I never meant to say border lines but actually grid lines. So perhaps though thanks to here I've figured out how to add 'border lines' that will look like the original 'grid lines' the question at this point remains, Why do the grid lines change color to black when re-merged (and perhaps I can re-ask, How does one get those grid lines back to it's default? Doing as I did makes them look like before but I guess at this point I would be changing the border lines to blue and not the grid lines, wouldn't I?)