Best format to ingest forecast data into Looker ?

Hey everyone !

So I am wondering what’s the best way to ingest forecast data into Looker which is csv/xls format? I am totally in the dark here.
Should it one of these 2 formats :

  1. I leave features such as region and vertical in their own columns so that later I can combine relevant groupings in Looker.
  2. I combine all relevant features into row names.

Or 

Is it something completely different?

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