http://www.powerdatasolutions.org/
http://www.nicktech.org/OR_Screenshots
http://www.edutech.nodak.edu/powerschool/templates/
https://sites.google.com/a/gwaea.org/psusers1/
Course records should not be deleted in PowerSchool, however you can make any course "inactive" in your building's course catalog.
To inactivate a course, go to School Setup > Courses and click on the link "Manage Courses for this building". This will take you to a screen that will list all courses with checkboxes next to each course. To inactivate a course, uncheck the checkbox next to the course you wish to be inactive in your building.
After doing this, the course will no longer appear in course lists in your building.