From your Dashboard go to Settings (Gear icon on the bottom left of the screen)

Under the Client billing section click on Invoicing settings

When on the Invoicing page, scroll all the way down to where you will find Communication Settings. There you will find fields for setting CC and BCC emails. You can add however many emails you want.

Just make sure you put, (comma sign) between emails.

When done adding emails, make sure to click on "Save Changes".

Key words:

CC, BCC, invoicing emails