When creating a 'Trim and Extend' feature to a cylindrical sheet body, the
trimmed sheet extends through the cylindrical sheet to the far side. The
trimmed sheet should stop at the nearest side of the cylindrical face.
Solution
Since there are two possible solutions for this scenario, the software doesn't
know if the farthest face is the limit, or the closest face is the limit.
So, NX creates two bodies as the output for the 'Trim and Extend' feature.
To delete the extra body select 'Insert-->Trim-->Delete Body' to delete the extra body created from the 'Trim and Extend' feature.
Notes and References
Hardware/Software Configuration
Platform: all
OS: n/a
OS Version: n/a
Product: NX
Application: DESIGN
Version: V9.0
Function: FREE_FORM_MODEL
Ref: 001-7609482