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The extracted mesh can be divided by target shape, possessed shape or mesh to create a mesh set. This option automatically divides the mesh sets when extracting elements from multiple solids simultaneously.
Geometry
Extract 1D/2D elements that have kept their node position from the edge/surface used for mesh creation. The [Skip Duplicated Faces] option can be applied when extracting a 2D element from a surface. This option extracts the mesh from only the non-overlapping surfaces of the selection. If the selected target surface lies on multiple solids in a complex manner, select all the solids and use [Skip Duplicated Faces] to extrude only the outermost surface of the solid.
Mesh
Extrude a 1D/2D element from the free edge/surface of an existing mesh. Only the selected nodes on the free edge/surface are extruded automatically and selecting the reference mesh extrudes only the nodes on the specified mesh.
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Extract a sub-element from an existing mesh on a geometry shape or a mesh set. The extracted mesh is connected to the existing meshes by nodes and is often used to create structural elements that are connected to the neighboring ground by nodes. During extract, the element properties can be defined or added and for 1D elements, the element coordinate system can be specified. 
