Stitching and Trimming Surfaces
The Stitch and Trim Surfaces command creates a group of trimmed NURBS surfaces from several intersecting surfaces (including NURBS surfaces or solids such as extrudes or sweeps).
This command may not be able to manipulate certain types of surface geometry. See Surface Geometry Requirements.
To stitch and trim intersecting surfaces:
1.
The surfaces must enclose a volume.
2.
Select Model > 3D Power Pack > Stitch and Trim Surfaces.
The surfaces enclosing the volume are stitched together and then trimmed, resulting in a group of trimmed NURBS surfaces.

Advanced 3D Modeling : Solids Operations : Stitching and Trimming Surfaces

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