Select the profile to be extruded.
Click Pad
in the Sketch-Based Features toolbar (Pads sub-toolbar).
The Pad Definition dialog box appears
and the application previews a pad with 10 mm as the default
dimension value.
In the Type box, set Up to plane.
Select the plane you want to use to trim the pad.
The application previews the pad to be created. The plane
trims the extrusion.
An Offset option
is now available.
Enter -20 as the offset value. This offset is the distance
between the plane and the top face of the pad to be created.
Click OK.
The pad is created. The specification tree indicates this
creation.