 Over the years, various formats, including group stages have been used.Reserve teams of the professional clubs, who compete in lower divisions of the league pyramid, were permitted to take part until 1990.For a number of years, only teams from the "Primera División", "Segunda A", about 23 teams from the "Segunda B" and the 17 "Tercera División" champions (or runners-up if the champion was a reserve team) were invited to enter, giving a total of 83.