Additional subkeys
How to generate an additional subkey
To generate and add an additional subkey to an existing certificate, see the following command, which exemplarily specifies the capability of signing and opts out the password protection:
$ sq key subkey add --cert $FINGERPRINT --can-sign --without-password
How to bind an existing subkey to another certificate
$ sq key subkey bind --key $KEY_TO_BE_BINDED_FINGERPRINT --cert $FINGERPRINT
To learn about the capabilities and other specifications of adding a subkey see chapter 'Adding a subkey'.