Blending Data in Google Data Studio with Scorecards to create calculated metrics

Blending score cards in Google Data Studio to create calculated metrics.

[trenchtown]

I am trying to do the same, but as I am pulling data from two different sources, the "Blend Data" option never becomes available. I checked and noticed that with two scorecards being pulled from the same source, it does appear. But using two different sources doesn't.

If there is an easy way to pull two sources together that include [date], [revenue] and [transactions] I am a happy man. I am trying to merge the revenue coming from a website and an affiliate...

[bhogalio]

how can you get this new metric in a date line chart to see the rate change over time?