If you open the CT600 return and click page 2. You can select the calculator icon next to box 155 and select other and then Capital Gains and Losses. This will allow you to list out the disposals in the period. These entries will then filter through to boxes 210, 215 and 220 on the main CT600 form. If the gains are reduced to nil by the losses box 220 will show blank but in the XML file that is transmitted to HMRC we will include the zero for you.