Thanks for posting this in the global Canvas Community!
I understand that you are working with a few people that are part of your 5 sections.
One nice part of Canvas is that you can assign content to specific students. If you are wanting to have them submit to an assignment, you can assign the assignments to those individual students. You can also do this with Discussions (See HERE) and Quizzes. (See HERE).
If need to have those students you are working with be placed into their own section, you could try and create a new section and move them to that section. HERE is the Canvas guide on how to edit section enrollments. Keep in mind that: Adding users to a section is a course permission. If you cannot add users to your course, your institution has restricted this feature.
