Additional calculation row in matrix

You need to create an additional row to your dim table where your "FS Description" is stored.
Then create a conditional measuse (like IF "FS Description" = "Calculation", Ventas totales" + "Costos operativos")/"Costos operativos).
Just to give you an idea without knowing your structure of data model

Hi Gingy2217 

You cannot assign a value to a row that doesn't exist so that extra row must exist first in your table. Please check out this tutorial. A link to a sample pbix is in the video description. https://youtu.be/R5fCJP6x03Y 

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