Hi @109951
Welcome to the Canvas Community!
I always recommend having your online course ready for your students before the start of term, and especially to not change the overall structure of a course during a term. Just confuses your students, and for some online learning is confusion enough.
However, Canvas does not do what you are asking for, but there is a long-standing feature idea for just this at https://community.canvaslms.com/ideas/4636-modules-within-modules - yet another thing I would not support. Check it out, read the discussion, and vote as you deem appropriate.
I am not sure what grade level(s) you teach, nor how your school organizes terms, but we create a new Canvas course for each term.
Kelley
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