Have you looked at creating a user category for each TA, then populating that category with the students in that TA's section? This scheme would eliminate the external file. The user category would show the students in alpha order, making it as easy to see the list of students there as in the external file. The search is easy: click on the user category.
To make it even easier, create an "enrollment record" book for each student. Tag that record with the section(s) that the student is in. Given that, creating or updating the user category is as simple as searching the enrollment records for the section name, selecting all the books, then dragging the author (the student's name) to the user category.
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