If you want to trim and create fillet in sketch then there are commands available for it. Edit sketch and look for command Fillet and Quick Trim. You can also use shortcut keys to start command. F for Fillet and T for Quick Trim.
Testing: NX 11 | NX 12 | TCIN
TC 11.2 | TC Vis 11.3 | AWC 3.2
I don't see any links or attachments in *this* thread
Production: NX10.0.3.5 MP5 + patch/TC11.2
Apparently I've turned into a gearhead