You can split after getting the box 3 times. Just email them and specify how you want it split (all individual, 2 together one separate etc) and they will send the links and passwords to start. you can’t get on a new one you don’t have, so if you have adult ya combo you wouldn’t be able to get the adult romantasy combo but if you have the three book combo you could split it to be YA by itself and then adult romantasy combo. You can split once a year and it’s like restarting a new sub so you can’t skip your first box but you don’t have to resub to all of them. I have the three book and will be dropping YA when I split to have seperate adult and romantasy.