@Hunter You can add multiple addresses, enter them with a comma between them, no spaces.

Where you wanna enter them.

Hi Guys, thanks for the reply. The email addresses must be sourced from a field on the record. They will not be static. I wonder if the CC field will accept a field reference like {custbody_res_team_email}... ?

Yes, that should work. Create a custom field to concatenate the required emails, and then insert that into the CC field in the Workflow action.

Thanks Mark. Seems it won't work. The cc parameter of an nlapiSendEmail call or a Send Email workflow action accepts only one of the following valid values: a single email address multiple e-mail addresses separated only by single commas null and the From Field option only accepts fields that are of type Entity (Employee)