Article L3142-105 of the French Labour Code
An employee who sets up or takes over a business is entitled, subject to a condition of seniority in the company and under the conditions laid down in this section : 1° Either to leave ; 2° or to a period of part-time work. Seniority acquired in any other company of the same group, within the meaning of article L. 2331-1, is taken into account as seniority in the company.