DFFs on a project template?

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I want to add a DFF, for an additional dept org name, on my project template. I tried adding to the "Additional Information" but that didn't allow me to. I searched for "Manage Descriptive Flexfields" and "Projects" as the module, however there isn't a way to add a new DFF. Am I in the wrong place? Has anyone done something similar? If yes, please point me in the right direction...

Thanks - Kim

University of Wyoming