How to use the manipulators in the Surface Fillet tool to build a variable chordal fillet.

1. Choose Surfaces > Multi-Surface Fillet > Surface Fillet to show the fillet control window.
2. In the control window, set Construction Type to Chord and check on Variable Fillets.
3. In the control window, set Chordal Type to Chordal length and Chordal Length to the initial chord length for the fillet.
   
4. After building the fillet, you can add several chordal manipulators along the length of the fillet and assign them different values.

   To...	Do This
   Add a new chordal manipulator	Click a point on the blue line running along the fillet surface.
   Select a manipulator.	Click the manipulator.
   Change the chordal length of the selected manipulator.	Drag the .
   Move the selected manipulator along the surface.	Drag the .
   Remove a manipulator.	Hold and click the manipulator.

5. If you want to specify the tangent length for all manipulators, instead of the chordal length, set Chordal Type to Tangent length.

   The appearance of the manipulator changes slightly. The Chordal Length field in the control window becomes Tangent Length.