Help on number of teams in association

Hi, I've a question. In the beginning, I want to start association (Fantazy draft) with all 30 teams and draft players for all teams. After fantazy draft I just want to play with 1 team. How to reduce my controlled teams number in association? I just want to control 1 team.

Thanks for answers guys.

if you have the right paid version of the REDitor, you could do the fantasy draft with all 30 teams, then export the association rosters into a roster file, then start an association with that roster controlling 1 team and not doing another fantasy draft