The Delete Face command differs from the Delete command (pressing the Delete key).
Because Delete Face creates a feature, you can use Edit Feature to make modifications just like any other feature, and then click Update to incorporate changes.
Some applications of the Delete Face command include:
Delete one or more faces to convert a part into a surface. On the resulting surface, apply a decal, and then save the part. Place the part in an assembly where the decal must span across two parts, using assembly constraints to position it.
The following image shows the result of delete face when the Heal option is not selected.

Delete one or more faces, using the Heal option to extend adjacent faces. Gaps between faces, such as when a fillet is deleted, are repaired by extending the adjacent faces until they intersect.

Delete a lump , such as a result of defining a mold base. When you model the mold shape and cut the part from the base, a lump remains. Use Delete Face to delete the lump from the cavity.

Delete a void to restore mass to the model. Some modeling operations, such as a shell without removing a face, create a hollow inside a model that you later want to remove. Because the void is hidden inside a model, you cycle through selections using the Select Other method to highlight the void to delete.

You can delete individual faces or all faces of a lump . The operation creates a Delete Face feature in the browser and automatically converts the part to a surface.

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Deletes a part face , lump , or void and automatically converts the part to a surface. The operation replaces the part icon with a surface icon and adds a Delete Face feature icon in the browser hierarchy.

Faces | Selects one or more faces to delete, depending on selection of individual face or lump. |
Select individual face | Specifies that one or more individual faces are to be deleted. |
Select lump | Specifies all faces of the lump are to be deleted. |
Heal | When individual faces are deleted, attempts to heal gaps by extending adjacent faces until they intersect. Not available for a lump. |