Do you replace existing bands? If so, you could simply copy the files into .data directory and replace the existing ones if you haven’t changed the data type. If these are newly generated bands you are on the right track.
It is true, the Band Maths within the Graph Builder does not support multiple bands at the moment. This will change in the next releases.
That the Merge does not work is probably due to the reason the one is geocoded and the other not. Set the parameter geographicError to NaN. Then it should work.
For the BandMaths operator I’ve attached an example how you can reference the first and the second product.
BandMaths_twoProducts.xml (623 Bytes)
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