Dear Annonymous,
1st thing If you have joined new establishment, you have to provide your UAN in the form 11 to new establishment. And It will be linked and no separate transfer required.
If for any reason, your new establishment have given new UAN, you have to transfer the old UAN to UAN under one member one UAN on member's portal.
You cannot withdraw the PF if your are in service. You may not be able to link Aadhar to new UAN as your Aadhar is already linked with old UAN.
Pl provide UAN to New establishment, for salary process for Jan 2018.
Thanks
Vidyadhar Bhat