Hi Lovely, you can see the details of what fields are mapped and in what direction they are mapped by downloading the fields mapping for the TFS Collection using the "tfsadmin projectserver /downloadfieldsmapping" command. If I understood your question correct
the answer is that you can update Remaining and Completed work in TFS and those updates will be sent to Project Server. Original estimate updates in TFS will not be sent to project server because in the default mapping that field is mapped to the baseline
Project Server field that does not accept updates through statusing (so it is only mapped to move data from PS to TFS but not in the other direction).
Thank you.
Federico
Federico Kolliker Frers - MSFT