Open each segment as a separate project, starting with the lowest level segment in the hierarchy.

Follow the steps to upgrade the model Cognos ReportNet Model Upgrade or Cognos 8.1 or 8.2 Model Upgrade. Do not repair the segment.

After the upgrade is complete, save the project.

Upgrade each segment in the hierarchy, working back to the master project.

Repair the complete model in the master project.

After upgrading the master project, check in each segment and then check in the master project.