Using both Bitcoin and Bitcoin Cash on ledger nano s

[Nomad88]

I have a question regarding bitcoin cash wallet on ledger nano s. This is mostly to double check in order to not make any stupid mistakes. I have ledger nano s which i have started to use after BCC fork. I have some bitcoin in the wallet. Now, i want to use bitcoin cash as well but when i try to change the chain i get question whether i want to split or main? What exactly am i supposed to do at this point? I was hoping there was an extra app for bcc chain which could make things easier. Your answer will be appreciated.

P.S; i have no BCC airdrop so i am just trying to use a bcc wallet as well.