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How to change the color for all faces of an existing feature on a model?
Solution
To change the color for all faces of an existing feature, select the feature on screen or in the Part Navigator and use MB3 --> Assign Feature Color
The change can apply the color edit to just the feature and/or Parent and Dependent features by expanding the Related Features area of the dialog.

Notes and References
Hardware/Software Configuration
Platform: INTL64
OS: window
OS Version: 2008
Product: NX
Application: GATEWAY
Version: V1847
Function: EDIT_OBJ_DISP
Ref: 001-7328546