Access:
Click
the 
icon, or select Curves
/ Spline from the main
menu.
Define the points through which the Spline passes.
Required Step 1 
Select points through which the spline will pass. Be careful when selecting points, because the spline will be created according to the order in which you select the points. You must select two or more points, and you can unpick points.
On picking the 3rd point, the Open/Close toggle option appears. Selecting Close creates a Free Slope closed Spline. In this case the 1st and last point slopes can be set to Free or Constant during the Optional Step. Example.
Press exit
when finished. If this is the final result, press OK
or Apply 
in the Feature Guide to complete the function.
Optional Step 1 
Set slopes for the ends. By default, both ends have Free slopes.
To modify the slope at the end of the spline, click the default Free parameter and select one of the Slope options: Free, Constant or Tangent C1.
In the example below, the arrow direction was changed to vertical.
Press OK or Apply in the Feature
Guide to complete the function.
Note: Splines created from 3 points, or from two points and fixed slopes, will be created as arcs.
Define the exact mathematic representation of this spline using control points with weights.
Required Step 1
Select points through which the spline will pass.
Note: You can toggle the Show Figures button to Hide Figures to hide the numbers shown, as shown in the example at the end of the procedure.
Optional Step 1
Pick the points to be used as control points and enter their weight value:
Modify the Spline weight values accordingly:
Toggle the Open/Closed button, as required to create an open or closed spline, as shown in the example below:
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Toggle the Show /Hide Figures button, as required to show or hide the control point numbers, as shown in the example below.
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When completed, the Spline will appear in the Feature Tree as follows:
