If you just want to send to multiple emails per subject, separate each email with a comma. Like this:
PHP Code:
$subjects=array("Department 1", "Department 2", "Department 3");
$emails=array("dept_1@domain.com,dept_1_2@domain.com,dept_1_3@domain.com", "dept_2@domain.com", "dept_3@domain.com");
Otherwise I am not sure I understand the question..