(e.g. in order to be able to "access" that fund with different wallets)?
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If not, is that possible with a hardware wallet?
- Yes you can access bitcoin held in one bitcoin address from multiple wallets if you have access to private key of that address. But if you are using wallets like coinbase, xapo they will not share private key so you can't access those bitcoin from other web wallets or from another coinbase wallet.
- Electrum is there where you can import bitcoin address using private key. Also blockchain.info wallet have option to import bitcoin address. If you want you can access bitcoin of one address from two different blockchain.info wallet after importing that address in both wallets.