The partner description section of a proposal needs a description of CERN that focuses on the department / group involved in the project. Tasks and relevant experience will vary for each project, as well as the CVs of the people concerned.
Some examples of CERN descriptions are available here, though please note these are not applicable to all projects:
- CERN description from AIDA-2020
- CERN description suitable for IT projects (example OpenAIRE2020)
You may also want to use information from the CERN public website.