Hi Ramesh,
you can try to use the CSV Comma delimited format. Try in your Test System or Sandbox then you can implement it in your GTS landscape .
for the CC retransfer the program you are using is the right one. but let me know are you executing the Program :/SAPSLL/STAWN_RETRANSFER_R3 in ECC ? if you do this then only it will be updated in the relevant Master Data Tables.
even i am not sure what Dhilipan is suggesting in his point of External UoM for CC.
Thanks ,
Srinivas Y