Removing B/II Teams

Hello

I'm playing FM for season 44/45 and have a lot of II teams in 3 liga. How can I remove them? I'm interested in any method to do this

(I only came up with a way in which you need to take all the reserve teams and play according to the 2-3-5 scheme). But I hope there is something better

I tried take all teams and go to vacation, but assistant still play 4-5-1 and continue win matches, so I need the way to relegate this teams

P.S. What can be reasons that assistant don't use my tactics(I selected the use tactic option when go on vacation)?