You can now set your Primary and Secondary tags for your Projects. The Primary tag can be used to sort your Project Listing View, as well as your Portfolios, and the Secondary tags can be used to filter through both the Listing View and Portfolios.
Within the Project, navigate to Project Settings through the drop-down menu.
Click on Project Information, and click Edit.
Scroll to the bottom where you will find Primary Tag and Secondary Tag. You can only enter one Primary Tag, but you can enter as many Secondary Tags as you'd like. To enter, simply type in the tag, and hit Enter.
Once you are done, click Save.