Re: Multiple seeds on one Coldcard?

I do not think it is possible, it is better you also buy seperate hardware wallet each to create multisig wallet.

Quote from: https://coldcard.com/docs/faq#:~:text=Can%20I%20have%20multiple%20wallets,words%20and%20is%20not%20independent.

Can I have multiple wallets in each COLDCARD?
There is a single "wallet", derived from the BIP-39 seed words. In addition, we have an optional "duress" wallet, which is derived from the wallet's seed words and is not independent. This means it gets backed-up automatically, and the original seed words also backup the duress wallet.

By adding a BIP-39 passphrase you can unlock nearly unlimited additional wallets which derive from the original 24 seed words. The passphrase you use defines the wallet and cannot be changed. BIP-39 passphrases are not backed up or otherwise tracked, which gives lots of freedom in terms of plausible deniability.