Use this page to select the undercut region on the die inserts.
If the undercut spans the split line, you need to select the undercut region in both the core and cavity die inserts.
If you have an existing contact profile, you don't need to select an undercut region. The undercut region is automatically selected using the contact profile. However, if you select an undercut, you will know that the correct undercut is covered by the contact profile.