Creating a 3D point in respect with a self created coordinate system

Hi,

I would like to create a 3D point with its coordinate in respect with a self
created coordinate system (not the origin). In the SW2003 help files I have
tried what it suggest but I'm unable to create the point in the self created
coordinate system, the coordinate of the point are always those of the
origin. How can I create a 3D point with the coordinate relative to a
coordinate system? Thanks for the help.

Coordinate System - 3D Sketching
When creating a 3D sketch, by default, you sketch relative to the default
coordinate system in the model. To switch to one of the other two default
planes, click the desired sketch tool, and press the Tab key. The origin of
the current sketch plane is displayed.

a.. To change the coordinate system for your 3D sketch, click the desired
sketch tool, hold down the Ctrl key, and click a plane, a planar face, or a
user-defined coordinate system.

b.. If you select a plane or a planar face, the 3D sketch planes rotate so
that the XY sketch plane is aligned with the selected item.

c.. If you select a coordinate system, the 3D sketch planes rotate so that
the XY sketch plane is parallel to the XY plane of the coordinate system.