Please follow the following steps to update the Trust capital gains in ITR.
Activate the Capital gain and save it.
Please select the option "YES" in item "Capital Gain" and add the details of Trust.
Manually Update the purchase details as "0" and date should 01.07.2018 and the sale date should be 30.06.2019 with the amount of $61 and select the exemption type as "50 % active Asset Reduction"
Note: Use a date range of 30/06/2018 for purchase and 30/06/2019 for sale. This then allows you to use the 50% discount method.