You can extendCore
Feature extends the internal shape of a cavity. A spatial
volume replaces material volume only where the core feature intersects with the
shellable or external feature within the same body.
Select a shape
definition.
Prism
is selected as the default shape definition.
Note:
The dialog box for the feature changes according to the
options offered by the shape.
Select a
sketch as the
profile required to
extrude.
Click
to reverse the direction of core.
Warning:
The core feature can only be used for shellable and external features.