When editting a subject it is sometimes convenient to create a new slide based on an already existing slide. In the subject editor it is possible to copy such an existing slide, both text slides and question slides, and start working on the new copy immediately.
The copy slide button is located on the top-right of the editor screen for slides:
This button will bring up a modal to help you choose where the copy should go:
If you have edit rights to the current subject the last position of the current subject is selected by default. Otherwise, you can select the repository, the subject, and the position within the subject.
After selecting the desired subject and pressing the green button the current slide will be saved, copied to the new location, and the editor for the new copy will be opened.