Greetings, Rebecca! Thank you for the questions.
- I think I would follow print for the table examples you shared, where print has divided a table horizontally in order to make it take up less space. I would only do this if I could follow print exactly.
- If a table's content were such that I would have to divide the table vertically or have runovers in even one entry, then I would fall back on a simple braille table layout, even if that simple layout took up many braille pages.
- I would not insert guide dots between unrelated columns. I hope the lack would help the reader to recognize the table's layout. In other words, I believe it would only be accurate to use guide dots between related columns and no guide dots between unrelated columns within one columnar arrangement.