In a Portfolio site create content for the following tools:
Resources, Forms, Glossary, Matrices, Portfolio Templates
Create a new Portfolio site with no content in it.
In the new site select Site Info > Import from site > I would like to replace my data
Select the 5 tools mentioned above and then Finish
Once the screen refreshes to the Site Info page check the tools to see if any content was imported.
Only Resources will have been imported.
Note: The 'I would like to merge my data' option imports over the content as expected.