For each recipient in your sequence, you can CC (or BCC) different recipients. Just add a column with the title "CC" (or "BCC") — no quotes — in your CSV. For each recipient (each row), specify the addresses that you want to CC. If you want to CC multiple addresses, separate the addresses with a comma. If some recipients don't have any addresses to CC just leave that cell blank.
CC or BCC the same address for every recipient
Want to CC or BCC the same address for every recipient in your sequence? You can specify a sequence-wide CC and/or BCC address on the Confirm step of your sequence or the Settings tab if your sequence has already been activated.
What happens if you use both?
If your sequence includes both a CC column and a sequence-level CC address, it will use the recipients-level column, not the sequence-level CC.
If one of your recipients has a blank cell in the CC column, it will use the sequence-wide CC address for that recipient.
The same goes for recipient-level and sequence-level BCC addresses: the recipient-level address takes precedence, and if it is not present, the sequence-level address will be used.