Import or add folder from an old project

I made a project and it gave solution problem. I had to create a new project and now I'm adding the old files. What happens is that when I import folders it does not matter, just files. So far it's reasonable, because the button says: Add existing item. Well, is there any way I can import a folder with all the files inside it? There are many folders. In the Script folder, I have a script folder for each controller. They are scripts related only to that controller.