When entering a contest you may see:
This means you can enter the contest more than once with different selections. Depending on the contest, you can enter a number of alternative selections or the same selections a number of times. Once you have entered your first selections, you will see the following pop up;
You can then choose to submit the same selections again or a different one. Both will appear in the Entered tab of your lobby as (1) and (2) etc.
An easy way to view all rosters at once is to right click on the BetAmerica header and select 'open link in new tab'. From there you are still logged in and can view your other selections, navigating back and forth to compare.