Enabling Second team (reserve team) to play in leagues

Hi all,

I am in mid save right now (FM24), playing in Romania's first league. I ignored my reserve team till now, and I assumed all the players I have are better off training with the main team, U19 team or simply being loaned out. So basically I have 0 players assigned to the reserves right now. However, I've noticed that some of the first teams have their second team playing in the 2nd or 3rd division. How would I manage enabling mine to do the same? Would it be enough to simply assign enough players to it and then, eventually, at the start of a new season, the team would enter the competition?

I feel it would make sense to actually have a second team playing in a lower league, it could be better than some loaned out players.

cheers.