Open the Steps tab of the Sequence page.
Hover over a template you want to add a CC/BCC and click Edit.
Click on the arrow in the top right corner of the Edit template window to open the CC/BCC fields.
Type the email address you want to receive a CC/BCC and press "Enter" button on your keyboard so email address is added.
Click Save.
Note: you must add a CC/BCC to each template separately.