Solution : https://service.sap.com/sap/support/notes/415425 (SAP Service marketplace login required)
Key words : 
tools -> administration -> administration -> client administration -> special functions -> copy transport request, choose menu option 'request/task -> object list -> include objects', tp import <request> <sysid> client <client> u18, transport management system, modifiable customizing request, tmw-relevant customizing tables, object list tmw_standard_cust, delivery class 'c', operating system level, temporarily add employees
Related Notes : 
       
| 447097 | Questions and answers concerning the TMW implementation | 
| 367301 | TMW: Generation report for TCVIEW Customizing |