To create a custom league you can select the New function under the League menu of the League Manager screen. You need to then assign your league a name and decide if you will create your custom league using stock teams (teams can be from any season you have installed) or as a free agent draft league. You now can select the number of teams, games in schedule and conference/divisional alignment.
Once these choices have been selected, you will be given the option to select which stock teams you would like to have in your league – or, if it is a draft league, which rosters to have in your free agent pool.
Once your league is created, a league with stock teams is ready to play. A draft league can be drafted from the Manage League Rosters screen.