Copy/move testcases

If you want them to only be in the new project, then move them in Windows to the new project folder and then use Add New Item to add them in TestComplete.

If you want to share them between projects, then go to the new project in TestComplete and use Add Existing. 

https://support.smartbear.com/testcomplete/docs/working-with/managing-projects/project-items/adding-and-removing.html