Follow below steps to create reports from derived reports

1. Login to TxReport portal using your credentials
2. Go to the View Report 
3. Click on Edit query om the report that you wish to allow derived
4. Enable => Allow Derived  And Click on Publish. Refer the Screenshot below

• Go to View Reports page, Click on the add icon at the top right corner and click on Report Builder

In Report Builder
Select Table field: Select the Base report with the help of the drop-down