Please be advised that any Bitcoin you had on your Trezor prior to the fork can be claimed, but you cannot currently claim the amount to your Trezor. You must claim the amount to an external wallet, you can find compatible wallets on the BitconCash website.
An update is in the works to get the wallet working with Bcash. So if your willing to be patient then you can store these coins along side your other coins. You can find the software and wallet at beta-wallet.trezor.io