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The Relief options are grayed out for a Threaded Hole feature.
Solution
To make the Relief options available, change the setting for Radial
Engage to Custom, expand the section for Relief, and toggle on Enable. The
Relief settings for Diameter, Depth and Angle will now be active.
Notes and References
Hardware/Software Configuration
Platform: all
OS: n/a
OS Version: n/a
Product: NX
Application: DESIGN
Version: V6.0
Function: FEATURE_MODEL
Ref: 001-6944206