Hi Karen -
Within Canvas, discussions run with a single topic. Each post contributes and based on the discussion's settings, those replies can be threaded. How do I create a discussion as an instructor?
It is possible to adjust the course settings so students can create their own discussion topics. While it's not exactly the same as a "sub-topic" within a discussion, it provides students with some control. This can be done within groups (within the course) too. How do I set details for a course? OR How do I allow students to create a course discussion?
I hope this is helpful! If you have any other questions, please reply. The Canvas Community will do its best to help and connect you with resources!
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