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Hi Trevin, Yes, it is possible. Here is an example from our test suite that does a similar thing: https://github.com/Unidata/thredds/blob/5.0.0/cdm-test/src/test/java/ucar/nc2/TestWriteMisc.java#L232 I suspect that you were missing the calls to setRedefineMode(). updateAttribute() *should* be able to do what you want, but failing that, I think that addGroupAttribute() will do the trick as well. Cheers, Christian Ticket Details =================== Ticket ID: HTH-916962 Department: Support netCDF Java Priority: Normal Status: Closed =================== NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.