The Erase Under Button: Erase Under Objects

The Erase Under button in the Modify Menu will erase the intersection area of non-selected objects with selected objects. The selected objects are not affected. This allows non-Manhattan holes to be cut in dark areas, for example. Suppose one needs a circular hole in a ground plane. Using this command, the task is simple. One would create the disk on some arbitrary layer where the hole is desired, select it, press Erase Under, then the Delete key to erase the disk object.