The Import wizard lets you select an exported file to load. By default this is a file with an .mdk extension. It will show which projects are being imported, and whether these will be overwriting existing projects in your ITP/MDK Repository, or are new projects being added.
When importing a project from an older ITP/MDK Repository a number of predefined folders is added to it, such as DIDs, Style Documents, Text Blocks, Forms, Field Sets, and Views. This is similar to the creation of a new project.
Note
Please use repdump or your DBMS to backup your database before importing.