Mount & Blade II: Bannerlord

Mount & Blade II: Bannerlord

My Little Warband
Radagos Raiders, and removal
so when i last used this mod, i took radago's raider and turned them into my starting unit(used another mod to let me recruit them)
im not sure how i did it before, but i was able to have them upgrade to elite recruits, i can not recall how i did so, as now the add button for upgrades to is unusable, and i can not give them a unit to upgrade to, witch i was able to before (i have even tried the MLW bandits sub mod) but that just turns bandits into custom soldiers (not the elites)....is this a new restriction on the mod? can i no longer make my own bandit set?(dont want to just change the sea raiders eta. i just want my own custom bandit troops)
also someone said that yo can just remove a troop with the "remove unit" button in the bottom left...but there is no such button
and lastly is there a way to remove sets? like i know you can just make all sets the same, but can i just remove sets?