Article 849-21 of the French Code of civil procedure
Substitution in the rights of the defaulting claimant shall be made by way of incidental application. Where the court grants a request for substitution of a defaulting claimant, it shall rule, upon receipt of submissions to that effect, on the transfer of all or part of the advance that may have been awarded pursuant to the dispositions de l’article 68 de la loi du 18 novembre 2016 susmentionnée. Substitution entails…