In Electrum, create a new multisig wallet. Choose the right configuration, e.g. 2-of-2. First signer: use master key, paste from the bb01 backup center from Bitcoin Electrum recovery key for a multisig wallet. Second signer, choose Enter cosigner seed. Enter the BitPay wallet seed, with the BIP39 checkbox. Wallet type: choose legacy multisig (p2sh). As the derivation keypath, choose m/48'/0'/0'. Done.
Notes: