You can delete the derived variables you have created. When you go to Derived Variables page on the Analyse Results section, you can see all the derived variables created. You have the option to edit and delete the variable. The steps to deleting a derived variable are as follows:
1. Go to Derived Variables section on the Analyse Results Page
2. Click on the delete button on the right side of the variable you want to delete
3. Click on Yes on the popup window.