Step 1 : Procedure with the Users Office

Proceed with the Contract Modification and Extension Form (EDH or Paper)
Attached a new Home Institution Declaration - HID (Valid for a period of 6 months following the date of signature)* English
To be completed by an authorized representative of the candidate’s home institution

You can find the full information on the following link: http://usersoffice.web.cern.ch/modification-and-extension

Step 2 : Procedure with the CMS Secretariat

Your Team Leader will need to submit a modification request in GLANCE database under the institute section and the "Management" category.