If you connect your HWW to your BULL Wallet you will have two on-chain wallets, the first being the default "Bitcoin Secure" wallet and the second your HWW wallet. It's currently not possible to have two liquid wallets, and not sure that's something that will be added int he future.

In the case of multiple individuals it's best east individuals has their own BULL Wallet app on their own device. As BULL is available on both iOS and Android.