Correct claim/election code for losses carried forward

Hi - I made a loss on shares that I sold which I got from an employer. I wish to report this loss to carry it forward into future years. What is correct claim code to enter in the "If you are making any claims or elections, select the relevant code: (optional)" box?

Hi Matt,
You won't have anything at this box. Your loss will be confirmed by completing the disposals/costs/losses in year boxes.
Thank you.