Jerry,
I'm sorry for the intrusion on this thread. I had only made a simple comment, and then others responded. It was not my intention, especially since the original question was marked as answered. I will direct responses to any comments I make in fture postings that deviate from the OP's question to a newly created topic if I need a response, if not, I will just add a statement at the end of my comments to please not respond.
As to your diagram, it is the ability to select the non-contiguous cells, and then be able to simulataneously select a specific part of the border edge, and then be able to change them all at once that I was after. That is something that is not possible in Numbers. It seems that in your diagram the "before", was attained by selecting each cell one at a time, and changing its border edge, one at a time. Then, in the "after", selecting the non-contiguous cells and changing the "Stroke" settings for the lines was attained simultaneously since that is possible in Numbers.
If I am correct in how you attained the results in your diagram, that wasn't really what I was trying to achieve, since if the option were not grayed out, it would only select the same border edge on all selected cells. If I am incorrect, then I would like to have your input.
Once again, sorry for allowing my comment to develop as it did.
In God's Harmony