Click Edit > Trim/Break > Trim or Break, and select a surface. The following menu appears.
Element
Select a single point (if marked by SURFCAM as a point), line, spline or arc to "trim/break the surface to." (When you trim or break a surface to a second surface you will use Element to select a second non-tangent surface.)
Video,
trim a surface to a spline
Video,
trim a surface to a line
Video,
trim a surface to another surface
Location
Used to "trim/break the surface to" a location. Select a surface. Then select a location. After you select a location, the Trim / Break Surface dialog box appears. The trim follows the flow lines of the surface in the major or minor direction.
Multiple
Chain a number of separate elements together to create an entity to "trim/break the surface to." The Select menu will be displayed and you will be prompted to "Select contour(s) to be chained, then 'Done'."
Surface Edge
Used to select the edge of a second surface as the trim/break element when trimming or breaking the previously selected surface. (When you trim or break a surface to a second surface that is tangent to the first, you will use Surface Edge to select the tangent edge of the second surface.)
Options
The default projection is perpendicular to the CView XY plane. If you want to project the element normal to the surface, click Options.
See also Surface Trimming Rules.