Creating Group Stages in an Association
 

So I've been going about 120 years of an Arena League, and in the bast 10 years I've created two other leagues in Mexico and Canada, and created a "North American Arena Baseball Association (NAABA)". 16 teams from three leagues make the NAABA playoffs.

These are awesome, and I've gone a few years of just having the playoffs, but I really want to have Group Stages or a mini-season. Any ideas on how I could go about doing this? I'm thinking just creating a Champion's league and just putting the top teams into that league.

Any thoughts?