Thank you for reaching out for assistance on the PowerSchool Community!
I understand you are trying to take an exam and make it into a practice assessment. I will submit a feature request to the PowerSchool Learning Production Team on your behalf to look into converting an exam assessment into a practice assessment.
You can choose not to publish the assessment and the assessment will not be added to the Published Subtotal score for the students.
However, since the questions that you have created on the Assessment will be in your Question Library, you can simply select and copy those questions into your Practice Exam so that you do not have to manually create the questions again.
I have provided an article below that will help guide you through the process of creating an assessment in PowerSchool Learning:
Please feel free to reach out to us if you have any further queries.