There are three ways to correct errors after the data has been imported.
Correct the data files and re-import the files. Each data table has a unique identifier, students – StudentID, teachers – TeacherID, classes – ClassID, and enrollment – StudentID/ClassID pair. The importer will search for any existing data that matches the identifier. If it finds a match it will use the incoming data to update the existing record. Note, that if import a new file that has a change in the key field, you will not override your old data you will simply be adding additional records.
Add the “Action” column to the previously imported data file with the value “Delete” in each row. When that data is imported the system will delete records that have the same key identifier. Then you can re-import the correct data. You would use this method when you have an error in a key field. See the Deleting the Data section.
Use the Admin UI to edit the data. (see the Modifying Teacher or Room Data and Modifying Enrollment Data section of the manual).
The first two methods should be used if you have a bulk error in your data import, the third method is useful if you discover individual errors, such as a misspelled name, or if you need to add or drop a student from a class.