How to add more teams into a league?

[city321]

Really fancy a career in Denmark managing Brondby but I don't like the lack of teams in the division so ideally I would like to add the top half of the division below the superliga into the superliga making a more enjoyable level of teams and change it so teams only play each other twice, I would then just refill that second division with teams from below that etc. Is this possible? I have been googling and reading everything I can find for hours and can't find any actual guide for how newbies to editing can do this?

Thanks for any help, I really would appreciate it