Service Contract Credit memo

Hi,

1) Created a one year contract with 6 product sublines under one service.Service contract total = $72.39

2) Terminated the 3 sublines after 2 days(i.e $0.39)

3) Invoice created for the $72.39

We have to send the invoice to the customer for the amount $72.00

Clarification:-

1) Will the credit memo create for the partially terminated lines amount for the contract or

2) do we have to create the CM manually against the invoice?

Please advice.