yeah exactly, I wasn't sure how to set up the passphrases with multisig, especially in a way that also works with unchained.
So if I import the xpubs into wallet software like Sparrow, I should be able to see which root addresses a given address is derived from, right? That way, when I'm depositing with a brand new address, I know which bucket I'm depositing into?
Yes, just make sure it is a separate wallet.
Since you are talking about splitting the wallet funds, I suggest you create a multiple wallet instead of using a single multisignature wallet for safety purposes.
You can reuse your backup seed, but the other master public key must be different, or, like they said, you can use passphrases to get a separated wallet.