It was difficult to learn how clone an existing project for a dual-core STM32H747i-DISCO board. Here are the steps that I used (after much researching and trials and errors):
1) Copy the existing project folder called 'OLD' into a new folder called 'NEW'.
2) In the new folder, rename \OLD.ioc to \NEW.ioc
There are three folders with six associated files that need attention:
\.project
\NEW.ioc
\CM4\.project
\CM4\.cproject
\CM7\.project
\CM7\.cproject
3) In each of these six files text files, edit them and replace all occurrences of 'OLD' with 'NEW'.
4) Double click on \.project. This will cause CubeIDE to import this project.
5) Rebuild the Run and Debug configuration settings.
