It is not possible to copy, duplicate or clone the existing structure or timetable lessons of a course.
You would need to set up the course - you can see how to do this here: How to set up Course, Class, Registration and Lesson registers. We also recommend taking a look at how to Build a course hierarchy in Arbor for how to organise your timetable structure.
You can then enrol students. If you will have the same students in this course as another, you could add an automatic enrolment.
If you instead want to copy over your current courses to the next academic year, please follow our New School Year Setup guidance.