Follow these steps to duplicate an existing portfolio:
Click the portfolio selector in the center of the Portfolio Editor’s navigation bar.
Choose Manage Portfolios.
You’ll be redirected to the Portfolio Manager.
Hover over an existing portfolio’s thumbnail.
Click Options in the thumbnails top-right corner.
Choose Duplicate Portfolio.
Important note: Allow some time for the duplication to be processed! Do not refresh or close your tab before the process is over!