there is a way to appear a pop up when clic in (https://www.simplemachines.org/community/proxy.php?request=http%3A%2F%2Fthemes%2Fsmsite%2Fimages%2Fbbc%2Ftable.gif&hash=8c187b6394e4dc3762230654faff0300d9679234) and ask the numbers of rows o columns to insert, this is very useful.
greetings