@ubw218 Thanks for this question!
Unfortunately, right now, the best approach would be to avoid it entirely. Here’s the issue discussing this: Full support for multiindex in dataframes · Issue #1493 · dask/dask · GitHub. I’d encourage you to chime in to support this use case! Also, here’s the most recent effort if you’re interested: [WIP] MultiIndex by jsignell · Pull Request #8153 · dask/dask · GitHub