To Edit a Surface Shape by Moving Knots
1. Click 
Style > 
Surface Edit. The Surface Edit tab opens.
Style > Surface Edit. The Surface Edit tab opens.2. Click the Options tab.
3. Select the Advanced Options check box. 
Show Knot Lines appears on the Surface Edit tab.
Show Knot Lines appears on the Surface Edit tab.4. Click Show Knot Lines. The knots are displayed.
Show Knot Lines. The knots are displayed.5. To adjust the number of knots, perform one of the following operations:
◦ Change the values in the Max rows and Max columns boxes to create equidistant knots.
◦ Right-click the surface and choose Add Row or Add Column from the shortcut menu to add a knot at the selected location.
◦ Right-click a knot and choose Remove Row or Remove Column from the shortcut menu.
 | You can also deactivate a knot without deleting it. Perform one of the following operations: • Select the knot. • Right-click a knot and choose Deactivate from the shortcut menu. A deactivated knot is displayed in green. |
6. Move the pointer over a knot that you want to move.
7. Hold down the ALT+SHIFT keys and drag the knot to a new location.
8. Click 
OK.
OK.