To Create a Boundary Blend
1. Click > 
Boundary Blend. The Boundary Blend tab opens.
Boundary Blend. The Boundary Blend tab opens.2. Create a one- or two-directional blend. Refer to the links below for more information.
3. Optionally, click the following tabs to further develop the boundary blend:
◦ Constraints—Controls the boundary conditions including tangency conditions for edge alignment and side curve influence.
◦ Control Points—Adds control points and shapes the surface by mapping locations on input curves. Right-click and choose Next Chain in the shortcut menu to leave the control point for a curve undefined and skip to the next curve.
◦ Options—Selects curves that influence the shape of the blended surface or approximate direction in the user interface.
◦ Properties—Renames the blend feature or shows information about the blend feature in a browser.
4. Click 
OK.
OK.