Click here: 
Open mhousing.sldprt or browse to <install_dir>\samples\tutorial\patterns\mhousing.sldprt.
Build the sample part. Click here to learn how
You need the sample part, mhousing.sldprt, to complete this tutorial. Do one of the following:
Click here: Open mhousing.sldprt or browse to <install_dir>\samples\tutorial\patterns\mhousing.sldprt.
Build the sample part. Click here to learn how
First you create the feature that you are going to pattern. You create a profile of an oblong on a reference plane. Use mirroring to take advantage of symmetry and to decrease the number of relations needed to fully define the sketch.
Click Hidden
Lines Removed 
on the View toolbar.
Click Front
on the Standard Views
toolbar.
Click Extruded
Cut 
on the
Features toolbar.
The SolidWorks application enters sketch mode because no active sketch is selected.
For extrude and revolve features, if no active sketch is
selected when you select the tool, you are prompted to select a plane,
planar face, or edge on which to sketch the feature, or to select an existing
sketch to use for the feature.
Select Front in the FeatureManager design tree to open a sketch on that plane.
Click Centerline
on the Sketch toolbar,
and sketch a vertical centerline through the origin.
Click Line 
on the Sketch toolbar, and sketch two horizontal lines
of equal length, beginning at the centerline.
Watch for the on-curve pointer
that indicates when you are exactly on the centerline.
Also, click View, Sketch
Relations to turn off the display of relations in the graphics
area if the relations obscure the sketch geometry.
