You can trim sheet through a selected curve, surface, plane, etc.
To trim sheet:
- Start the “Trim Sheet” command
(Surface Ribbon Bar => Surface Operations Group => Trim Sheet)
- Select surface to trim.
- Click the middle mouse button to activate the boundary tab in the command dialog box.
- Select the trimming object.
- Click “Ok” in the command dialog box finish command.
Tip: If you want to trim the other region in the selected surface change the option in the “Region” tab from “Keep” to “Discard”.