If you still need to collect and grade student work for a student who has an Incomplete grade, then you need to talk with your institution.
If you simply want to edit content for next semester, then you have two options:
- Import the content into the new course shell if it's already been assigned to you.
- Import the content into a "sandbox" (developmental) course shell. Your school can create one for you.
When you import content, I strongly recommend that you "remove" the dates. Also, I recommend that you choose the option to import "selected" content so you can choose what you want to bring over.