Currently have a process that sends an email I want to cc a group and an entered input variable that connects to an email. Is there any way I can send an email to both a group and a process variable?
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You can wrap everything in a single expression, which would return an array of group(s), user(s), and/or literal text email addresses (wrapped in toEmailAddress()), and I think that would work. The one drawback is I don't think you'd be able to easily hardcode your group like you can when you use the field as a Picker - but as far as I can tell you have to either use it as a Picker or use it expressionably, but not both.
Adding here that you cannot send en email to a group, only to all members.
I'm unclear exactly what distinction you're making here, but to be clear AFAIK a group *is* a valid target of the Send Email node, as the result will be that the email is sent to all members (the group, itself, does not have an email address).