To Modify an Envelope
1. Click Model > Manage Views > Envelope Manager. The Envelope Manager dialog box opens.
2. Select the envelope to be modified.
3. Click Edit. The Menu Manager opens prompting you to confirm. You can also right-click the envelope in the Model Tree and select Edit Definition from the shortcut menu. The Envelope Definition dialog box opens.
When you modify the list of components in an envelope, all simplified representations using that envelope are also updated to reflect the changes.
4. Click Envelope Geometry. The envelope activates for redefinition.
5. To modify an envelope created with a shrinkwrap method, redefine the shrinkwrap feature by excluding or including components, and then update the envelope geometry.
6. Use the Cut & Surface tab options to create new features for the envelope part.
7. Click OK.