Parallel toolpaths are parallel to the X axis or Y axis of the current setup. To slant the toolpaths relative to the axis, set the Parallel angle attribute on the Strategy tab.
This figure shows X parallel toolpaths.
Y parallel toolpaths are shown here.
This method mills only the area above and down to the surface(s) in the feature. If part of the stock does not have a feature surface in it, that area won’t be milled away, except perhaps incidentally to the manufacturing of another surface feature. For parallel-like roughing, use a Z-rough with a zig-zag option to cut at multiple depths.
For information about 3D Manufacturing attributes, refer to 3D Milling tab and Manufacturing attributes.