Hi Paolo Ziveri
Do you want to create a new project or import a existing project?
If you want to create a new project you just have to go file->new Kinetis SDK 1.x project, name your project, choose your board (TWRK60F120M), select processor expert and SDK if used and finish. if you want to import a project you have to go file->import...General->Existing Projects into Workspace->Select root directory and finish.
I recommend you to check the KDS_Users_Guide.pdf that is located in the installation path of KDS_v3/doc chapter 2 Working with Projects explain how to create and import projects in KDS
Hope this information helps, if not, please describe your issue a little more.
Have a great day,
Jorge Alcala
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