Adding more Cc fields

Hi there!

I was trying to add three more Cc fields so that each field would
contain only one e-mail address.
The RT users here find it too “laborious” to edit a comma-delimited
list, since they use the automatic form-fill. In other words, it is
easier to only choose an e-mail address (previously filled in the form)
per field.

What I have done so far is copied the field, but now I know I have to
concatenate de four $ARGS{Cc} variables, so at the end I’ll get a
comma-delimited list in the array.

Does anyone know how I could do this?

Thank you very much!