Picks you've made for the Supercontest can be copied to any private leagues you're a part of to save you time having to manually pick games again. This is done using the copy button you see at the top of the pick selector:
After clicking this button you'll be asked to confirm which league you'd like to copy your picks too and if you want to copy your Straight Up and/or Against the Spread picks:
And then the next message will ask you confirm you wish to copy your picks and acknowledge that this will replace any picks you have made for the upcoming games:
As the message states, any stakes you may have placed on your picks won't be copied across to your private leagues. You'll have to go and manually add a stake to your picks.