This video explains what portfolios are and how to use them.

Transcript:
In OneDesk, portfolios are like folders that contain your projects. Right now, you can see I’m in the “Projects” application and have one portfolio that contains two projects. Portfolios can be nested as deeply as you want and, in fact, you can put a project in more than one portfolio simultaneously. To rearrange projects, just drag and drop them between portfolios or, in fact, put them outside of portfolios.

To create a new portfolio, click “add portfolio” and complete the form. A new portfolio was created and is added to my account. I can then drag and drop to move my projects into portfolios.