If you want to re-use the content of one of your courses from a previous course — in particular, the Description and any custumizations you made to the Timeline content — then you can use the Clone feature instead of starting from scratch.
The Clone This Course button is available in the Actions section of the Home tab.
Some courses, including most from 2018 or earlier, have Timeline content that is incompatible with changes we've made to the training module system. The Clone This Course will not appear for these courses.