Custom Roster for Playoff mode?

Hey guys, I spent time building a bubble roster to simulate playoffs, but I can't seem to find a way to start playoff mode with it. What's the best way to do this?

I also tried starting a myleague with it but it's taking too long to force wins for each team in the simulation to set the standings how i want

You're going to want to use this - https://www.youtube.com/watch?v=cMM33n7Q3Ew

Hey thanks for the reply. Unfortunately I am on PS4 so I don't see a way for me to do this unless 2k actually releases correct rosters