Hi dhaval
It is quite simple. When you have the cone selected, there is a field near the bottom of the input screen called: 'Has Flare or Knuckle?'. Click on that field and a little check box appears. Check that box, and a dialogue screen will open up allowing you to state the knuckle and flare radii.
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Sincerely,
Ray Delaforce
CADWorx & Analysis Solutions
Hexagon PPM