Hello there, @Sophie10 ...
Assignments are tied to the course itself. There's no connection that I am aware of where you could have students submit an assignment in one course and it is also automatically submitted in another course.
When people have questions about linking content in one course to another, I typically do not recommend this...because more than likely students in course "A" are not also enrolled in course "B". So, if in course "A" you had a link to a page in course "B", when students click on that link, they would probably get an error message because students in course "A" aren't also enrolled in course "B". But, if students are enrolled in both course "A" and "B", then that link would work.
I hope this information will be of help to you. Sing out if you have any other questions about this...thanks!
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