You can do so by navigating to any candidate’s Assessment report and scrolling to their challenge solutions. You will see a link to Create as interview.
Clicking this link will launch a modal enabling you to add up to 5 of the challenges and solutions from the candidate's report to an upcoming interview.
Click Create interview to generate a link to the Interview. It will also show up on your Interviews page, with a Template Name called From report.
When you open this Interview, question tabs will automatically load with the selected challenges and the candidate's code.