Generation of B-class surface from Given A-class surface

The above video shows the simplest way of creating the B-Class surface of Bumper from the given A-class Surface.

The video provides you the alternate steps for creating the required
patch work of missing surface in B-Class surface when offset from the A-class surface with the given offset distance.
THank for

Видео Generation of B-class surface from Given A-class surface канала Dinesh