Submitting multiple lineups is easy!
This can be done immediately after submitting a roster as once your roster is submitted, you are presented with the below message. From here, you can return to your dashboard, or create a new lineup. When submitting an additional lineup your are given the option to ‘start fresh’ (create a line-up with no players selected), or you can ‘keep lineup’ (this will maintain the roster you just submitted and you can change the players who wish to remove while maintaining the essence of your already submitted roster)
If you choose to submit an additional roster at a later time, by going to the lobby and selecting the Tournament from the list of available contests. Click on the contest and click “Build Lineup”
For details on contest entry limits please see How many entries can I submit?