CERN has formal procedures in place concerning:
The Open Calls with potential relevance to CERN can be found here.
All EU proposals, coordinated or not by CERN, need to be approved before submission via EDH.
A project description needs to be attached to the EDH using the appropriate template (for Marie-Curie actions, for ERC grants or for any other EU project). The templates can be found in the EDH document.
For more information, please contact the CERN EU Projects Office.