In general you should manage only one candidate move for positions, where it’s your turn. Sometimes you want to maintain alternative moves to be more flexible though. If you add more candidate moves you can define these as “best move” too. Only if you mark these alternative candidate moves as “best moves” too you will be trained in these lines as well. You have to adjust the training parameter on the Correct Move group page in the training ribbon to tell the program to accept these “best moves” otherwise only the top-ranked candidate move will be accepted and considered for training.