If the teams in your league are going to play teams outside of your league, you can add in Non-League Opponents which add as a placeholder for events your leagues teams will be attending. They do not appear in standings and you cannot add rosters/stats for non-league opponents
Add Non-League Opponent
Navigate to Teams in the menu bar and click Non-League Opponents
Click New Opponent to add one in manually
Click Import Opponents to add multiple at the same time. Ensure the CSV is in the same format as the Sample Spreadsheet
Once added, you can Edit and Delete any Non-League Opponent
You can now create a game and the non-league opponent will appear in the drop down of teams to pick from
These Non-League Opponents can also be added from miscellaneous locations like in the Advanced Event Add or the Import Events page. With importing events, if the top level division is set to Non-League, that team will be imported as a Non-League Team and then will become available season wide