Uh, no. Under no circumstances are you allowed to have 2 (or more) active teams at the same time, even if you don't intend on using one of them anymore. 1 team per person, that's it.
If you've messed up somewhere, simply rebuild. Everyone makes mistakes with their team, you just have to learn from your mistakes and move forward.
If you really don't want the team anymore then you'll have to go inactive and after your team has gone bot THEN you can create a new team and start from scratch if you wish.
Anyway, this is Help forum stuff so if you need any more information or want to discuss it further, please move your thread over there.