Import project 
Click on the button, and select the project that you
want to import. After the import is completed, the following message appears:
Then you can open the imported project by clicking on the 
(Open project) button.
Click on the button, and select the project that you
want to import. After the import is completed, the following message appears:
Then you can open the imported project by clicking on the (Open project) button.
The project retains its code
and gets as a Title the name of the .sdf file.