How to make a timetable cronstructed by sections from another timetable

Hi!. I'm working with a timetable data of several years and I want to extract some data from this timetable and construct a new one. The problem is that the information needed is taken by sections of this whole table, in a discontinued form (right now I don't have a function to do it, so, I'm doing the selection by choosing the rows I need). Now, with more than 8 shorter timetables I don't know how to merge them. The function JOIN as far as I know can only merge 2 tables. If you have a better idea of how can I do that I will apriciate it.