
Create the lines needed to define the coordinate system. Two lines are needed for the direction of the first axis and the general direction of the second axis on the (first axis, second axis) plane. Create the lines by using another geometric construction line interface.

Click CSByLines on the Geometric Construction Palette.

In the Assign Axes To box, select the initial axes and plane to define.

In the Coordinate System box, select Direct.

Select the first line for the direction of the first axis.

Select the second line for the general direction of the second axis.
A preview of the coordinate system displays. The direction of the third axis is determined by the righthand rule.

If there are multiple solutions for the first or second axis, such as when a line extends beyond the origin, click , select a tracking point, and select the needed value for Track Flag.

If the third axis is not in the needed direction, select Indirect in the Coordinate System box.
The direction of the third axis flips.

Click Continue.
Temporary geometry displays in the graphic view and as CSByPoints in the Geometric Construction Explorer.

If needed, create additional geometric constructions.

Click Close to return to the main command ribbon.
The geometric constructions are not created and saved to the model until you click Finish on the main command ribbon to create the model object.