New Post: Copy ContactForm (Composite C1)

If you mean CC and BCC, the Contact Form doesn't do it.
But you can customize it to do so.

The form itself is rendered by an XSLT function Composite.Forms.ContactForm:

Here, you can see that it uses a C# function with parameters to send an email

<f:function name="Composite.Forms.ContactForm.Functions.Send">
...
</f:function>

It is available in /App_Code/Composite/FormsContactForm/Functions.cs

The C# function in turn uses the static SendMail method where it makes a message from the values in the input parameters.

I think, you can:

1. extend this method with 1 more parameter, say, string cc
   and add its value to mailMessage.CC = cc;
   
2. extend a public static method Send with similar parameter for 'CC'. This method calls "SendMail"
   
3. Then in the XSLT function I mentioned above, you should also add another parameter - for CC. And also pass its value to the Composite.Forms.ContactForm.Functions.Send. Something like:
   

<f:function name="Composite.Forms.ContactForm.Functions.Send">
...
<f:param name="toCCEmail" value="{$toCCEmail}" />
...
</f:function>