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To create a custom list from any type of student data you can search for the group of students, and then export from PowerSchool. So, if you wanted all students that ride bus #100, use your search string in PowerSchool:
Student_Number for the field (all we need is Student Number), Comma as the Field Delimiter, uncheck Column Titles on 1st Row, Submit and Save the text file.
Then login to School Messenger:
You now have a list in SchoolMessenger of all students marked as riding bus 100 in PowerSchool. This method is also useful for an activity or club roster. The possibilities are endless.