Details
Embedded sketch is not available in Flange Dialog of NX12 and latest versions.
However it was available in older versions of NX
Solution
To better support multiple instances within a feature, the embedded sketch functionality has been removed. You can use Unbend, Rebend, Normal Cutout, Bend Taper, and so on to customize flange shapes.
Hardware/Software Configuration
Platform: INTL64
OS: windows
OS Version: 1064
Product: NX
Application: NX_SHEET_METAL
Version: V12.0.2
Function: FLANGE
Ref: 002-8015429