This script can be added to a Dashboard and will create the ability to add many Iterations and Releases to specific projects. AKA - Timebox creator. This script is for use "as is" and is unsupported.
1. Add the application to your dashboard called "Custom HTML" . (https://techdocs.broadcom.com/us/en/ca-enterprise-software/agile-development-and-management/rally-platform-ca-agile-central/rally/extending-rally-with-apps/using-rally-apps/app-catalog/custom-html.html)
2. Navigate to this Github repository https://github.com/RallyTechServices/timebox-creator and select the "deploy" file
3. Select "Ugly.txt" file
4. Copy all the contents of the Ugly.txt file
5. Add the contents of the file in step 4 to the new app in the "html" section (in the settings of the app).
7. Create Iterations or Releases as needed and add them to specific projects.