You can use the Slicing tool to create 2D sketch sections that are at the intersection of the source geometry and a reference plane.
The Slicing tool creates 2D sketches and sketch planes at the intersection of a reference plane and standard SOLIDWORKS BREP geometry, mesh BREP geometry, and graphics bodies. You can use the 2D sketches to create solid or surface geometry and for reverse engineering or to create references for features based on a sliced section of the model.
To access this tool, click
.To slice standard SOLIDWORKS BREP bodies using linear and point entities: