While creating a piece, you can declare its symmetry by using the Create symmetry axis function.
Complete the following steps, to create a symmetry axis:
Step 1 – select the first point;
Step2 – select the second point.
The axis resulted is displayed on the piece as a dotted line. Each time a symmetry axis is selected, its properties are displayed in Context options. The properties of the symmetry axis are the notches, which can exist on the piece after the symmetrization, or not. The notches’ parameters (the type, the length, the width, the direction and the layer) can be modified. So that there should not be notches created by the symmetry axis on the symmetrized piece, uncheck the following options: Add notch on First point and/or Second point.