Menu: Geometry->Delete
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The deletion of entities can be done in two ways: at one level (point, line, surface or volume) or erasing all entities at once. A selection is made (see Entity selection) in both cases. After pressing escape (see Escape), the entities are erased.

If the 'Also lower entities' check option is set then are deleted the selected entities and also its dependencies if possible (if are not shared by undeleted entities)

To undo the selection of entities, press Clear selection in the Contextual menu.
Entities that form the basis of higher entities cannot be erased. For example, if a surface is created over some lines, it is necessary to erase the surface before erasing the lines.

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