When filing an SA100 tax return with Capital Gains, you need to file the return with a backing schedule.

If you have a brokers schedule you can simply complete the totals on the face of the return and then click file / attachments to add the schedule. This needs to be in a PDF format.

Alternatively, on page 1 of the CGT pages, you have the option for CGT wizard. This allows you to enter the disposals in the year. Once done the software will populate the CGT pages with the entries, and then create and attach the CGT schedule as a PDF file to the return. This can be seen under File / Attachments.