Create a core sketch on a tooling body (main core or cavity).
Click Core
on the Mold Tools toolbar, or click Insert,
Molds, Core.
In the PropertyManager, set the options as described
below, then click OK 
.
You can extract geometry from a tooling solid to create a core feature. You can also create lifters and trimmed ejector pins.
To create a core:
Create a core sketch on a tooling body (main core or cavity).
Click Core
on the Mold Tools toolbar, or click Insert,
Molds, Core.
In the PropertyManager, set the options as described
below, then click OK .
A new body is created for the core and is subtracted from the tooling body.
In the FeatureManager design tree, in the
Solid Bodies folder 
, a new folder named Core
bodies appears the first time you create a core.
Additional core bodies you create are stored in this folder.
To facilitate viewing the
core, hide the tooling body.
Bounding sketch
for core 
. Displays the name of the selected core
sketch.
Extraction
direction.
Select an entity in the graphics area to define the extraction direction.
The default direction is normal to the sketch plane. If necessary, click
Reverse Direction 
to extract the core in the opposite direction.
Core/Cavity body. Displays the name of the tooling body from which the core is extracted.
Draft On/Off
. Adds draft to the core. Set Draft
Angle.
Draft outward.
(Available when Draft On/Off is selected). Creates an outward draft angle. If cleared,
an inward draft angle is created.
End Condition.
Select the end condition in the extraction direction. If you select Blind, then set Depth
along extraction direction 
.
End Condition.
Select the end condition away
from the extraction direction. If you select Blind,
then set Depth away from extraction direction
.
Cap ends. Select to define the end surface of the core, if the core ends within the tooling body.