Once you create an IP, you can manage it using the Manage IP tab of the Manage IP Wizard. You cannot modify the IP using the Manage IP wizard and its table entry cannot be modified either. It is possible to delete and recreate IPs if changes are necessary. The IPs can be exported and imported to XPE Exchange format files.
If a Clocking Wizard IP is deleted, its clocks are also deleted from the available selection of clocks. Sheets that refer to a deleted clock will continue to use the clock frequency of the deleted clock to estimate power, but the clock cell will be highlighted in yellow to indicate that it is no longer valid. The clock can be recreated using the Clocking Wizard IP and restored by selecting it from the list of available clocks.