Is it possible to add a single row to a single column creating a single cell at the bottom of thte table?
Insert row granularity is table, not individual column based. Any version of Pages.
You could have tested this yourself in less than a minute.
So, that would be no?
The table is rectangular. If you want to achieve the appearance of what you are after put nothing in the neighboring cells on the last row, with no cell borders.
Retrieving data ...