What is the process I have to do for a sublease ? 

You have to send us your request, signed by all the tenant mentionned on the lease contrat, including :
The purpose of the sublease
The length of the sublease
The amount you will ask
A draft of the contract
Once we have all the elements, the regie will give you an answer within the next 30 days.
Link to this question:https://www.pilet-renaud.ch/en/faq/results/question/z3eclqjKD6xh5LTM