Creo Flexible Modeling > Modifying Analytic Surfaces > To Modify an Analytic Surface Feature
  
To Modify an Analytic Surface Feature
1. Select a surface to modify.
2. Click Flexible Modeling > Modify Analytic. The Modify Analytic Surface tab opens.
3. Type a new value for the Radius or Angle or use the drag handle to change the value. For a torus you can modify both radii.
4. To set additional attachment and propagation options, right-click and use the shortcut menu or use the Attachment and Options tabs.
 
* When the Attach modified geometry check box is not selected, the resulting geometry is a quilt. The appearance of the original solid surfaces is propagated to both sides of the resulting quilt.
5. To maintain tangency between the modified geometry and neighboring geometry:
a. Click .
 
* If the flex_tan_propagation_default configuration option is set to on, tangency is automatically propagated.
b. If needed, set conditions for neighboring geometric entities using the Conditions tab, the Add condition option, or the shortcut menu.
6. Click or middle-click to accept the feature.