You can create a cutout defined either by a sketch or an open geometry.
The surfacic flange is still open from the previous task.
Select the surface from the geometry area to define the working plane.
Click Sketcher .
Click Elongated Hole to create the contour.
Click to create the first point and drag the cursor.
Click to create the second point. The first semi-axis of the profile is created.
Drag the cursor and click to create the third point. The second semi-axis is created and the oblong profile is displayed.
Click Exit workbench to return to the 3D world.
Click CutOut .
Select the sketch.
A cutout is previewed with default parameters.
The vectors show the side and the direction of the cutout.
Select the Dimension type to define the limit of your cutout.
Click OK.