B-Tree to Partitioned index

Is there anyway to move from a "normal" b-tree index to a locally
partitioned index online without having to to a rebuild?

We have fairly large databases (15 TB for the one that we are
concerned with now) and we need to get one of the highest hitting
indexes rebuilt into a partitioned index, but we have no way to do
that elegantly when we are dumping nearly 50 GB an hour into the
database 24 hours a day.

Suggestions?  Docs are not OVERLY helpful here... 

Thanks
aj
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