An attribute that was created on the Resource object is not available for the project Team Staff list filter. 

Is there a way to add it?

Release : All Releases

Component : CA PPM STUDIO

The Resource and Team attribute are two seperate objects, it's not possible to add custom attributes from one to the other.

There are some attributes from the Resource object that are available to add to the Team list/filter, but these are all out of the box fields that were added as part of the system provider query that is used by the Team views. Unfortunately, the system provider is not something that can be updated to include any additional Resource object fields.