Okay. So I make one tournament template with a season, that I load every time and then use "save as" function each time to save as new file?
Yes. Make sure you save each tournament as a new file.
As a shortcut, you can also set that saved tournament as the Default tournament. On the Preferences tab, press the
Config Files button. The first item on the right should be "Default Tournament". Press the
Browse... button and find the saved tournament you use to create each new tournament. Then press the
OK button to save the preferences.
Now, on the Game tab, you can just press the
New button any time you want to start a new tournament. Make sure to select the middle item ("Create a new tournament using the saved tournament "your_saved_tournament_filename.txt" as a template"). This will create a new tournament by loading the saved tournament, resetting the status back to the start of the tournament, undoing any buy-ins (and rebuys or add-ons), and resetting the filename (which forces you to save it as a new file, avoiding accidentally overwriting the saved tournament file from which it was created).