In the new lesson, insert the block template that contains the blocks for that lesson.
Verify that all of the appropriate blocks have been transferred to the appropriate lessons.
Return to the original lesson, and delete the blocks that are no longer needed. (Or, if you create and copy block templates for all of the blocks in the original lesson, you could just delete that entire lesson).
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Here's how to divide a long course into separate courses:
Here's how to divide an existing lesson into multiple lessons: