You can file a consolidated E-TCS return for all offices/branches, if you have more than one office/branch. In this case however, you should quote the same TAN. You can also file E-TCS returns office/branch-wise individually. In such cases you need to have a separate TAN for every branch. In case you do not have separate TANs for each branch then you should apply for a TAN for each of the branches and then file the E-TCS returns individually.