Hello MrMagnum,
When it comes to multiple programmers working with code in separate projects, it would be best to begin with source control. There are are multiple problems that you can run into when you’re just trying to migrate code from one project to another. One would be the API that all of the classes are in, another would be the includes. Unfortunately, other than the editor being able to Generate Visual Studio Project files for you after adding your code to the Source folder, there aren’t many tools available for merging C++ otherwise.